Using gigedit to modify the PitchbendRange of an instrument results in a corrupted gig file if the option "Save" is used. Using the option "Save as" (to a different file name) works fine. Confirmed on two different gig files (moog6.gig and Steinway model C_r1.gig).
I just committed a fix for this. I tested with Steinway model C_r1.gig, but I couldn't find moog6.gig.
Confirmed bug fixed with moog6.gig too (it was one of the freebies at worra's some years ago, just 28 KB so lightweight for tests). Thanks!