nabocorp softwares

I've been using cam2pc to view and losslessly rotate my pictures. I wanted to use JHead to save the exif thumbnails out to a file, but JHead seems to generate corrupt jpegs for the thumbnails of the pictures which have been rotated. Has anyone else had problems with thumbnails for rotated images?

It could be a JHead problem, but there's obviously some connection to the cam2pc rotation. Oh... I'm using cam2pc 4.5.

Any advice would be appreciated.