Hi everyone!
I was working in a project where in Glyphs2, I decided to open that file in Glyphs3 —just for take a look— And now, I can’t to save it from Gyphs3 to Glyphs2.
I found couple of Topics before in the Forum, but, I still considering those parameters, —means, go to Font Info> Other> Switch from Version 3 to Version2—, but it still doesn’t work. And then, just appear this.
I haven’t set any Custom Parameter yet, so, didn’t get it.
PLEASE, any piece of advice?
I’m attaching another picture, just in case!
You seem to have set the Font.previewRemoveOverlap. You need to set this to True to be able to write the file as format 2.
Thank you for your reply Georg
I don’t remember configuring anything, is there a button to disable that option you mention?
I haven’t found anything on this topic in the Glyphs Forum and Manual.
Open up the Macro window and type
Font.previewRemoveOverlap = True, then run that.
Thank you very much Sebastian, I really appreciate it.
But why did that happen? I mean, I hadn’t activated anything about it. 
Can you open the original v2 .glyphs file again and see if you can just save it again?
Yep, it’s working now, but, as I asked Sebastian, I don’t know why these things happen.