Guess I'll have to put my pants on then. No really, renaming them didn't work. It says I don't have permission to upload that type of file. It's a JPEG. Anything else you can think of? I'm logged in, have posted more than 5 posts, I have posted for sale pictures in the past.
You might try to change the file suffix from JPEG to JPG or jpg. Although they are all supposed to be mean the same type of file, programmers don't always allow all the suffixes when they write their code. And it's also always a good idea to remove any embedded blanks in file names (in addition to any punctuation which Mike mentioned). Embedded blanks often cause trouble when working across different file systems. Actually, considering the number of things which can go wrong, it's amazing that things mostly work.