This conversation has been merged. Please reference the main conversation: Lightroom: Edit In External Editor does not work/function
Unexpected error performing command: bad argument #1 to 'lower' (string expected, got nil)
And searching through various threads and forums the best I can find is this thread (which is closed for comment) http://forums.adobe.com/message/42492... but reinstalling PS doesn't seem like a reasonable solution for a bug in LR4.
Any fixes coming?