Long shot, but my experience with Coppermine from a long time.
I know most of this you will have covered, but best to start from the start.
* Is your PC turned on... (only joking)
Coppermine is a bit of a @@@@@ system, you have probably checked your file permissions a few times trying to get it to work, I'd start with re-setting them.
Permissions on the /albums, /albums/userpics, ...



