showgroups.php is blank

[begin]

forum get showgroups.php is blank. i'm try search for problem , but can't fix it.
using version 4.1.2 , I've upgraded a few times and it's still showing blank.

thanks in advanced

[Lynne]

Here is a page from the manual about troubleshooting blank or 'white' pages: http://www.vbulletin.com/docs/html/blank_pages