I have used Glyphs (Version 1.3.7 (340)) without any issues on OSX 10.6.* But under 10.7.4 the ‘Font Info’ window closes each time i attempt to input into a text field. The error message that pops up when the Font Info closes is “The operation could not be completed. No other information is available about the problem.” I also get this same error message if i try to save the font (cmd-s). This occurs with every font i try, so it can’t be font corruption. If i start a new font in Glyphs, i am able to use the Font Info ok, and save the font.
Python version is 2.7.3
Not seen this reported before, but it cripples Glyphs for me on OSX Lion 
The current version is 1.3.11. If you are on Lion, I recommend you update to the latest version. You can do so via the app preferences.
He seems to be using the App Store version.
Can you enable Preferences > Expert > Restore pre-Lion saving behavior?
Yes - enabled ‘restore pre-lion saving behaviour’ but still find no way to update. What next?
ok so i enabled ‘restore pre-lion saving behaviour’ && also re-installed from app store, and the issue has disappeared 
But is the ‘app store’ Glyphs a few versions behind a non-app store version? If so how can i move to the non-app store version?
vernona
The AppStore version is a few weeks behind because of Apple’s lengthy verification process.
I had this problem too, and discovered that the file was probably “locked” in some Mountain-Lion-specific way that Glyphs doesn’t yet recognize. You can work around it by hitting “Duplicate” (“Save as”) and saving a copy. The copy can then have its font info edited.