Bug: glyphs crashes OS X while exporting

I have a huge Problem.

while exporting a font, it is not only that Glyphs crashes, my whole OS system is paralysed — only option: restart physically.

as far as I figured out the problem is in the “remove overlap”. a non melted font-file is exporting well.

debugging via generateFont.command is not possible as glyphs crashes before generating any data generated (just empty folders in the “temp” folder)

—> any Idea how to fix this?

Running on OS X 10.10.2
with both cutting-edge versions of glyphs 1.0 and 2.0
both having the same problem with the same file

using the bracket and the brace trick for some letters

can you send me the .glyphs file?

on its way.