diff --git a/CMakeLists.txt b/CMakeLists.txt
index a5286abff..c42ad9f7a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -398,13 +398,27 @@ target_include_directories(cereal INTERFACE include)
 
 # l10n
 set(L10N_DIR "${SLIC3R_RESOURCES_DIR}/localization")
-add_custom_target(pot
+add_custom_target(gettext_make_pot
     COMMAND xgettext --keyword=L --keyword=L_CONTEXT:1,2c --keyword=_L_PLURAL:1,2 --add-comments=TRN --from-code=UTF-8 --debug
         -f "${L10N_DIR}/list.txt"
         -o "${L10N_DIR}/Slic3r++.pot"
     WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
     COMMENT "Generate pot file from strings in the source tree"
 )
+add_custom_target(gettext_po_to_mo
+    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+    COMMENT "Generate localization po files (binary) from mo files (texts)"
+)
+file(GLOB L10N_PO_FILES "${L10N_DIR}/*/PrusaSlicer*.po")
+foreach(po_file ${L10N_PO_FILES})
+    GET_FILENAME_COMPONENT(po_dir "${po_file}" DIRECTORY)
+    SET(mo_file "${po_dir}/PrusaSlicer.mo")
+    add_custom_command(
+        TARGET gettext_po_to_mo PRE_BUILD
+        COMMAND msgfmt ARGS -o ${mo_file} ${po_file}
+        DEPENDS ${po_file}
+    )
+endforeach()
 
 find_package(NLopt 1.4 REQUIRED)
 
diff --git a/resources/localization/es/PrusaSlicer.mo b/resources/localization/es/PrusaSlicer.mo
index 17ba9216d..3f0272294 100644
Binary files a/resources/localization/es/PrusaSlicer.mo and b/resources/localization/es/PrusaSlicer.mo differ
diff --git a/resources/localization/es/PrusaSlicer_es.po b/resources/localization/es/PrusaSlicer_es.po
index ef2db8b67..088ff479b 100644
--- a/resources/localization/es/PrusaSlicer_es.po
+++ b/resources/localization/es/PrusaSlicer_es.po
@@ -6865,7 +6865,7 @@ msgstr "Textura"
 
 #: src/slic3r/GUI/ConfigManipulation.cpp:200
 msgid "The %1% infill pattern is not supposed to work at 100%% density."
-msgstr "Se supone que el patrón de relleno %1% no funciona a una densidad del 100%."
+msgstr "Se supone que el patrón de relleno %1% no funciona a una densidad del 100%%."
 
 #: src/slic3r/GUI/FirmwareDialog.cpp:530
 #, possible-c-format
diff --git a/resources/localization/fr/PrusaSlicer.mo b/resources/localization/fr/PrusaSlicer.mo
index 130bda334..f43e20ddb 100644
Binary files a/resources/localization/fr/PrusaSlicer.mo and b/resources/localization/fr/PrusaSlicer.mo differ
diff --git a/resources/localization/fr/PrusaSlicer_fr.po b/resources/localization/fr/PrusaSlicer_fr.po
index cc796ba74..243fb44e9 100644
--- a/resources/localization/fr/PrusaSlicer_fr.po
+++ b/resources/localization/fr/PrusaSlicer_fr.po
@@ -7013,7 +7013,7 @@ msgstr "Texture"
 
 #: src/slic3r/GUI/ConfigManipulation.cpp:200
 msgid "The %1% infill pattern is not supposed to work at 100%% density."
-msgstr "Le modèle de remplissage %1% n'est pas censé fonctionner avec une densité de 100%."
+msgstr "Le modèle de remplissage %1% n'est pas censé fonctionner avec une densité de 100%%."
 
 #: src/slic3r/GUI/FirmwareDialog.cpp:530
 #, c-format
diff --git a/resources/localization/it/PrusaSlicer.mo b/resources/localization/it/PrusaSlicer.mo
index 2f17472a6..be6f9fd44 100644
Binary files a/resources/localization/it/PrusaSlicer.mo and b/resources/localization/it/PrusaSlicer.mo differ
diff --git a/resources/localization/it/PrusaSlicer_it.po b/resources/localization/it/PrusaSlicer_it.po
index 8cba94768..5d1a965bb 100644
--- a/resources/localization/it/PrusaSlicer_it.po
+++ b/resources/localization/it/PrusaSlicer_it.po
@@ -6865,7 +6865,7 @@ msgstr "Texture"
 
 #: src/slic3r/GUI/ConfigManipulation.cpp:200
 msgid "The %1% infill pattern is not supposed to work at 100%% density."
-msgstr "La trama di riempimento %1% non è fatta per lavorare con densità al 100%."
+msgstr "La trama di riempimento %1% non è fatta per lavorare con densità al 100%%."
 
 #: src/slic3r/GUI/FirmwareDialog.cpp:530
 #, possible-c-format
diff --git a/resources/localization/zh_tw/PrusaSlicer.mo b/resources/localization/zh_tw/PrusaSlicer.mo
index 8f51236f7..12b1a17eb 100644
Binary files a/resources/localization/zh_tw/PrusaSlicer.mo and b/resources/localization/zh_tw/PrusaSlicer.mo differ
diff --git a/resources/localization/zh_tw/PrusaSlicer_zh_TW.po b/resources/localization/zh_tw/PrusaSlicer_zh_TW.po
index 1e7bc4488..ce35bc342 100644
--- a/resources/localization/zh_tw/PrusaSlicer_zh_TW.po
+++ b/resources/localization/zh_tw/PrusaSlicer_zh_TW.po
@@ -3292,7 +3292,7 @@ msgstr "這個 "
 #: src/slic3r/GUI/Tab.cpp:1309
 #, no-c-format
 msgid ""
-" infill pattern is not supposed to work at 100% density.\n"
+" infill pattern is not supposed to work at 100%% density.\n"
 "\n"
 "Shall I switch to rectilinear fill pattern?"
 msgstr ""
diff --git a/resources/profiles/PrusaResearch.idx b/resources/profiles/PrusaResearch.idx
index 3b2720300..c451bb8bf 100644
--- a/resources/profiles/PrusaResearch.idx
+++ b/resources/profiles/PrusaResearch.idx
@@ -1,4 +1,5 @@
 min_slic3r_version = 2.2.0-alpha0
+1.1.1-alpha2 Bumped up config version, so our in house customer will get updated profiles.
 1.1.0 Filament aliases, Creality profiles and other goodies for PrusaSlicer 2.2.0-alpha0
 min_slic3r_version = 2.1.1-beta0
 1.0.6 Added Prusa MINI profiles
diff --git a/resources/profiles/PrusaResearch.ini b/resources/profiles/PrusaResearch.ini
index 893bef040..ae8962e51 100644
--- a/resources/profiles/PrusaResearch.ini
+++ b/resources/profiles/PrusaResearch.ini
@@ -8,7 +8,7 @@ technologies = FFF; SLA
 
 # Configuration version of this file. Config file will only be installed, if the config_version differs.
 # This means, the server may force the PrusaSlicer configuration to be downgraded.
-config_version = 1.1.0
+config_version = 1.1.1-alpha2
 # Where to get the updates from?
 config_update_url =
 changelog_url = http://files.prusa3d.com/?latest=slicer-profiles&lng=%1%
diff --git a/src/libslic3r/Utils.hpp b/src/libslic3r/Utils.hpp
index bf0fbfa72..06c435809 100644
--- a/src/libslic3r/Utils.hpp
+++ b/src/libslic3r/Utils.hpp
@@ -66,9 +66,12 @@ extern std::error_code rename_file(const std::string &from, const std::string &t
 
 // Copy a file, adjust the access attributes, so that the target is writable.
 int copy_file_inner(const std::string &from, const std::string &to);
+// Copy file to a temp file first, then rename it to the final file name.
+// If with_check is true, then the content of the copied file is compared to the content
+// of the source file before renaming.
 extern int copy_file(const std::string &from, const std::string &to, const bool with_check = false);
 
-// Compares two files, returns 0 if identical.
+// Compares two files, returns 0 if identical, -1 if different.
 extern int check_copy(const std::string& origin, const std::string& copy);
 
 // Ignore system and hidden files, which may be created by the DropBox synchronisation process.
diff --git a/src/libslic3r/utils.cpp b/src/libslic3r/utils.cpp
index 2b867c8af..b7155ddc8 100644
--- a/src/libslic3r/utils.cpp
+++ b/src/libslic3r/utils.cpp
@@ -448,31 +448,45 @@ int copy_file(const std::string &from, const std::string &to, const bool with_ch
         if (with_check)
             ret_val = check_copy(from, to_temp);
 
-        if (ret_val == 0)
-			rename_file(to_temp, to);
+        if (ret_val == 0 && rename_file(to_temp, to))
+        	ret_val = -1;
 	}
 	return ret_val;
 }
 
 int check_copy(const std::string &origin, const std::string &copy)
 {
-	std::ifstream f1(origin, std::ifstream::binary | std::ifstream::ate);
-	std::ifstream f2(copy, std::ifstream::binary | std::ifstream::ate);
+	std::ifstream f1(origin, std::ifstream::in | std::ifstream::binary | std::ifstream::ate);
+	std::ifstream f2(copy, std::ifstream::in | std::ifstream::binary | std::ifstream::ate);
 
-	if (f1.fail() || f2.fail()) {
-		return -1; 
-	}
+	if (f1.fail() || f2.fail())
+		return -1;
 
-	if (f1.tellg() != f2.tellg()) {
-		return -1; 
-	}
+	std::streampos fsize = f1.tellg();
+	if (fsize != f2.tellg())
+		return -1;
 
 	f1.seekg(0, std::ifstream::beg);
 	f2.seekg(0, std::ifstream::beg);
-	bool ident = std::equal(std::istreambuf_iterator<char>(f1.rdbuf()),
-		std::istreambuf_iterator<char>(),
-		std::istreambuf_iterator<char>(f2.rdbuf()));
-	return(ident ? 0 : -1);
+
+	// Compare by reading 8 MiB buffers one at a time.
+	size_t 			  buffer_size = 8 * 1024 * 1024;
+	std::vector<char> buffer_origin(buffer_size, 0);
+	std::vector<char> buffer_copy(buffer_size, 0);
+	do {
+		f1.read(buffer_origin.data(), buffer_size);
+        f2.read(buffer_copy.data(), buffer_size);
+		std::streampos origin_cnt = f1.gcount();
+		std::streampos copy_cnt   = f2.gcount();
+		if (origin_cnt != copy_cnt ||
+			(origin_cnt > 0 && std::memcmp(buffer_origin.data(), buffer_copy.data(), origin_cnt) != 0))
+			// Files are different.
+			return -1;
+		fsize -= origin_cnt;
+    } while (f1.good() && f2.good());
+
+    // All data has been read and compared equal.
+    return (f1.eof() && f2.eof() && fsize == 0) ? 0 : -1;
 }
 
 // Ignore system and hidden files, which may be created by the DropBox synchronisation process.
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 458d39860..61fe97277 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -8,6 +8,11 @@ add_library(Catch2 INTERFACE)
 list (APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/modules/Catch2)
 target_include_directories(Catch2 INTERFACE ${CMAKE_CURRENT_LIST_DIR})
 add_library(Catch2::Catch2 ALIAS Catch2)
+if (APPLE)
+	# OSX builds targeting OSX 10.9 do not support new std::uncought_exception()
+	# see https://github.com/catchorg/Catch2/issues/1218
+	target_compile_definitions(Catch2 INTERFACE -DCATCH_CONFIG_NO_CPP17_UNCAUGHT_EXCEPTIONS)
+endif()
 include(Catch)
 
 set(CATCH_EXTRA_ARGS "" CACHE STRING "Extra arguments for catch2 test suites.")