You might try a part database rebuild
Part->Regenerate parts database
and see if that fixes it. I may get adventurous and clone the latest repo (updates on Windows7 at least are currently broken) and see if it is a problem with the parts. The IchigoJamT is new this year (but I think loaded for me before). The Zero looks to be my update from a year or so ago and it used to load fine. It the rebuild doesn’t work clearing the user directories may help:
There are two user directories (with your parts and the parts database) which don’t get touched during an install (to not affect your sketchs during upgrades). On Windows they are in
c:\users\username\AppData\Fritzing\roaming\Fritzing (which is a hidden directory so you need to enable hidden directories in explorer) and
c:\Users\username\My Documents\Fritzing (where username is your windows id)
If you don’t have any parts or sketches you want to keep you can just delete those two directories and Fritzing will receate them, or you can move them aside by renaming them if you wan to keep something in them.