Sounds familiar, we ran into that problem with images saved in JPG format from PsP, if the "Chroma Subsampling" was changed from the default setting, the image would only load into a few programs. Opening the file and saving with the default JPG Chroma settings solved the problem.
Chroma default in PsP = "YCbCr 1x1 1x1 1x1 (None)"