i'm not sure how to do that and i don't think i'm able to but i've texted my mate who owns the site with me and he should be able to do it and i'll let you know the results after i've done some testing with it. I'm tempted to try re-uploading the whole mod again just for the hell of it incase something didn't upload correctly.
My friend also doesn't know where to turn on php logging, where would i go to turn it on?
edit: i found it, i'll post the log in a few moments once i've uploaded an image.
ok i set the logging file to forums.errorlog.txt and tried to select the vbavatars to get that error again, but the text file remains empty so i assume either i've set it up wrongly or there was no errors.
EDIT: Ok i had a play around and i managed to get it working, ok what it is was i was going to settings then edit avatar and clicking use vbavatars having not gone to /forums/avatars.php first and made one, i thought that using that options would direct you to the editing your avatar but it doesn't, maybe you could add that in future versions so that its not confusing, my stuff seems to work now but the only issue was what you mentioned about the pre-defined dimensions, i get a nice black background where my PNGs don't reach the dimensions, (see screenshot) but at the moment i'm not too bothered as i'm just playing around, i'll wait till thats been fixed before i go live with it.
also i found a problem with the mod on view profile (well i consider it to be a problem at least) see screenie: