When I edit an image with double click on a thumbnail RT 5.1 crash, I am on MacOSX Sierra (10.12.5), RT 5.0 rc1- gtk3 work fine.
Here the begin of the log
Process: rawtherapee-bin [2573]
Path: /Applications/RawTherapee.app/Contents/MacOS/rawtherapee-bin
Identifier: com.rawtherapee.rawtherapee
Version: 5.1.0 (5.1.0)
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: rawtherapee-bin [2573]
User ID: 501
Date/Time: 2017-05-30 12:23:45.883 +0200
OS Version: Mac OS X 10.12.5 (16F73)
Report Version: 12
Anonymous UUID: 931D2B50-552D-3ECA-DDD8-AA3E7A9CAC22
Time Awake Since Boot: 12000 seconds
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Application Specific Information:
Assertion failed: (!scaled_font->cache_frozen), function _cairo_scaled_glyph_page_destroy, file cairo-scaled-font.c, line 459.
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x00007fffc4160d42 __pthread_kill + 10
1 libsystem_pthread.dylib 0x00007fffc424e457 pthread_kill + 90
2 libsystem_c.dylib 0x00007fffc40c6420 abort + 129
3 libsystem_c.dylib 0x00007fffc408d893 __assert_rtn + 320
4 libcairo.2.dylib 0x0000000104271dc7 _cairo_scaled_glyph_page_destroy + 155
5 libcairo.2.dylib 0x00000001042743e4 _cairo_scaled_font_free_last_glyph + 146
6 libcairo.2.dylib 0x0000000104273535 _cairo_scaled_glyph_lookup + 559
7 libcairo.2.dylib 0x0000000104273bdb _cairo_scaled_font_glyph_path + 128
8 libcairo.2.dylib 0x00000001042468d1 _cairo_gstate_glyph_path + 203
9 libcairo.2.dylib 0x000000010423b4a7 cairo_glyph_path + 42
10 libpangocairo-1.0.0.dylib 0x0000000104173426 pango_cairo_renderer_show_text_glyphs + 778
11 libpangocairo-1.0.0.dylib 0x0000000104172b2e pango_cairo_renderer_draw_glyphs + 38
12 libpango-1.0.0.dylib 0x00000001041a1daa pango_renderer_draw_glyphs + 66
13 libpango-1.0.0.dylib 0x00000001041a17ce pango_renderer_draw_layout_line + 750
14 libpango-1.0.0.dylib 0x00000001041a13e7 pango_renderer_draw_layout + 236
15 libpangocairo-1.0.0.dylib 0x00000001041728e0 _pango_cairo_do_layout + 59
16 rawtherapee-bin 0x000000010266a1c7 EditorPanel::info_toggled() + 3591
17 rawtherapee-bin 0x000000010267b597 EditorPanel::open(Thumbnail*, rtengine::InitialImage*) + 4215
18 rawtherapee-bin 0x00000001026ba0e8 FilePanel::imageLoaded(Thumbnail*, ProgressConnector<rtengine::InitialImage*>*) + 872
19 rawtherapee-bin 0x0000000102670746 sigc::internal::signal_emit0<bool, sigc::nil>::emit(sigc::internal::signal_impl*) + 246
20 rawtherapee-bin 0x00000001026badb3 ProgressConnector<rtengine::InitialImage*>::emitEndSignalUI(void*) + 19
21 libgdk-3.0.dylib 0x00000001040e3931 gdk_threads_dispatch + 50
22 libglib-2.0.0.dylib 0x00000001034d948e g_main_context_dispatch + 279
23 libglib-2.0.0.dylib 0x00000001034d977d g_main_context_iterate + 413
24 libglib-2.0.0.dylib 0x00000001034d99d3 g_main_loop_run + 207
25 libgtk-3.0.dylib 0x0000000103bf697a gtk_main + 74
26 libgtkmm-3.0.1.dylib 0x000000010362049a Gtk::Main::run(Gtk::Window&) + 156
27 rawtherapee-bin 0x000000010270e2eb main + 8123
28 libdyld.dylib 0x00007fffc4032235 start + 1
Thank’s in advance