Ran into an unusual bug - we had some images we could open and edit (just using Snagit to resize and some other minor edits to images sent to us), but they always gave us an error when we tried to save them. After tons of experimentation, we found that they were using the CYMK colorspace (apparently they had been converted for print). Using ImageMagick to convert them to sRBG made the problem go away. I don't expect SnagIt to handle weird random things like CYMK JPGs, but better error handling would be appreciated. We really had to dig to figure this one out.