Sisiphos alert: corner components disappear

I have got a problem with a font which is entirely based on corner serif components:
Every time I load the glyphs file most of the corner components which were fixed before disappear again.
The problem occurs since about January 19. It seems like a degenerative disease.

When I load a Glyphs file and quit the app again without changing anything on the font I noticed that the file is saved nevertheless and the latest changes on components are being destroyed again.

I run Glyphs 2.5b (1109) on MacOS 10.11.6.

Thank you in advance!

That was a bug in 1109. Please get version 1111.

Thank you, Georg!