Glyphs 2.6.6 (1343) is error while open TTC files

未能打开文稿“ Avenir Next.ttc ”。 Error while reading the document: /System/Library/Fonts/Avenir Next.ttc

( - [ NSNib _initWithNibNamed:bundle:options: ] could not load the nibName: SelectFontView in bundle NSBundle </Applications/Glyphs> ( loaded ) . )

there is an issue with the localisation. Can you disable localisation of Glyphs in Preferences > User settings and restart the app (it should be in english afterwards. If not, you need to add English to the list of languages in System Preferences > Languages). Then the import should work.

I upload a new version, soon.

Problem solved. Thank you!!!