Make sure on reinstall that you
delete the old version of vbgallery.php manually!!
Long time ago I explained someone how to debug that file..
It was not your problem.. but similar..(a blank page)
Check it out.. maybe it helps
http://www.photopost.com/forum/1207759-post104.html
good luck
Luc..
PS:
I will install the module sometime tomorow..
if i get that error.. I will let you know