The pictures look quite similar here, but the strokes are different.
Just trying to be logical - if opening the file and rewriting it fixes this problem with no further issues, and the box is otherwise perfect, I would suspect
1. Software (libpng.so, libjpeg.so, gimp, whatever)
2. If you compiled plenty of stuff on one box, you could have the problem that your distro is expecting one version of a file, but 'make install' actually placed another version there. This is best solved by upgrading if you can't find it quickly, but can lead to insane faults.
Divide & conquer. If you eliminate gimp, or write .tiffs does the problem go? If you write jpegs does it return?