The most likely problem is corruption in the user and/or temp directoies which on linux are supposed to be in ~/.config/Fritzing. If you rename this directory Fritzing should recreate a new version of it (and wipe out any sketches that you already have which is why to save a copy). Also the latest version is 9.3 so you may want to try and upgrade as well (although there may not be a version of 9.3 for the PI yet). Good luck!
Peter