[MTUSUPPORT]

I have no answer for this, other than what one of the Beta testers has just found. Here is his response in the Beta forums.

Just something I recently noticed with some zip files I created. If you have a zip file that has been compressed using anything other than "Normal" compression such as "maximum" Hoster will be unable to load and play the zip file. Sometimes the song appears in the playlist with either a duration of 2 seconds or 0:00 while other times nothing appears in the playlist and Hoster will just lock up and need to be shutdown. If I re-zip the mp3 and cdg files using normal compression everything works fine.