image will not load into item master

Is anyone aware of any specific issues that would prevent an image from loading into the Item Master. NOTE 952632 just suggests that the file is corrupt but it opens in several image editors so I am relatively convinced that it is not corrupt. It is also not a size issue in that I have larger images loading. It is occurring with a variety of images. I have hundreds that load just fine but some that do not. The permissions and location of all images, those that load and those that do not, are the same.