If there is no error then I would suggest looking on your webserver for the file as paths can be funny things. I often have problems with relative paths and I once had a file on my server called "myimage/1_10002_112.jpg" instead of it actually creating the file in myimage directory it created it part of the name
Check your webserver for the file, its probably in a weird place and try get the relative path (i used my hosts control pannel to find out what the path was)
Cheers
Dal