While I'm on Windows not a Mac, the "Unable to open temporary file" sounds like a file permissions problem somewhere (unfortunatly fritzing isn't very good at telling you what file it is unhappy with 
). I'd check that your user ID has permission to write to the parts directory (which is in the same directory as the code on Windows). It sounds from the last couple of messages that the parts database has become corrupted with a failed parts update. The cure to that (after you have exported and saved outside of fritzing any parts or sketches that you want to keep!) is to delete the parts and user directories which on a Mac are apparantly in /Users/username/Documents/Fritzing/parts (your parts, at least grab a copy of this before making changes!) and ~/.config/Fritzing (the database and probably what you want to delete). Neither of these files are affected by a reload so that your sketches don't get affected by an update and if they don't exist fritzing will recreate them.
Peter