Photopost doesnt allow photos over 2mb to be uploaded????
Under that test account I uploaded two 3 or 4 mb files succesfully before getting to the 3rd file which was 5mb and then that one got stuck in queue because of the file space limit.
My PHP allows either 6 or 8 MB files and I do not have a file size limit set in PhotoPost.
File Size aside, I would assume this is going to happen with small 500K files also, just keep uploading until the limit is reached and the last one that goes over gets stuck in queue??
I deleted your two test photos, currently the test account has no visible photos but the file space stills reads about 5MB being used because of that file in the upload directory.