When launching Minecraft 1.7.10 with Forge (tested with latest build) on OS X (known to happen at least on 10.9 "Mavericks" and 10.10 "Yosemite"), the game crashes after the loading screen if fullscreen mode is enabled. This only happens with the loading screen enabled, and only when using Minecraft's built-in fullscreen option (not with OS X's fullscreen button on the window title bar). When enabling fullscreen in the options the game doesn't crash right away, which makes sense, because then the loading screen doesn't show.
FML log: http://gist.github.com/dgelessus/64c719dfcc50779fbdfb
(OpenEye is installed, but the issue also happens without any additional mods.)
OpenEye reports, if those are of any use:
http://openeye.openmods.info/crashes/96954deca961223947314ecededcbe52
http://openeye.openmods.info/crashes/cb51ab387e2c01bb212dd7d19154b176
http://openeye.openmods.info/crashes/b9aeb70e6f3684a9d8d0cc8edaa3d689