First you say none of the files are located? Saying this I presume none can be found on your pc using search? I upload cdg temp files and have uploaded a new cdg while at a gig. I can not do this while hosting karaoke, but do it while I'm playing DJ music. I can stop for long enough to load in a single track from someones disc they brought in and others are patient.
Now for your files that do not appear, click this link and check what I've written in two different areas in that thread. It may help you if you are using an older hoster version and vista. This drove me nuts until I figured it out. I could load in a new cdg and could not find the files on the hard drive, but they would show up on hoster search.
http://forum.mtu.com/showthread.php?t=9982&page=2