Hey, I just updated to the latest Glyphs version 2.6.5 (1292) today and started getting these errors on export:
Something went wrong with the Remove Overlap filter in glyph: Adieresis
It’s a new glyph each time, but seems to only be uppercase compound glyphs.
I followed advice in old, but similar posts; I compiled and updated features, but no success.
I’m on MacOS Sierra 10.12.5
Any guess?
Same error here, with the same version but on Catalina :s
Try emptying out the Temp folder and restart the app.
If the problem persists, consider temporarily downgrading to 1291:
https://updates.glyphsapp.com/Glyphs2.6.5-1291.zip
Edit: corrected the version (1291, not 1191).
Just emptied it out with no luck. Will downgrade soon 
EDIT: Just downgraded and I am having the same error.
What version did you have before?
2.6.5, the latest.
EDIT: Prior to that, I think it was 2.6.4
Sorry I posted the wrong link at first. Now updated, try again please.
Same issue here.
I tried 1291 and the issue remains.
1292 is available for download now.
Not sure which one I had. But haven’t updated in a while, so not a very recent build.
Does it work when you run the Remove Overlap filter in the edit view?
Just tried with the new version 1291 and almost worked :s
macOS 10.13.6, G2.6.5 [1292] – I just tried it in Font View and Edit View; neither worked.
I’m on it.
Just tried [1293] in Edit View, and now it is cutting out the overlap although not deleting it.
Can you send me a sample?
Not necessary now. Just went back and tried it again so it’s working now. Strange.
If it happens again I will send the file.
Latest build is complaining about Overlaps and when I turn ‘Remove Overlap’ off the built fonts are all screwed up
It’s working for me now, on 2.6.5 (1293)