I could not reproduce this bug with the image at http://justinpryzby.com/astro/m27.00000001.Dumbbell_Nebula.FIT
This FITS file loads fine, but is shown as all zeros. Thus, the support for FITS is broken, but don't see any crashes, string corruption or such. Could you check if you can repeat the behaviour mentioned in the original bug report with the latest version of imview, 1.1.8-3? If there's a GPL compatible C or C++ library for reading FITS-files, please let me know, I might add support for them at some point. Thanks, Teemu
