Search forum function broken?

[gvr41520]

I can't search the "cars for sale" sub-forum from regular or advanced search fields. After entering search parameters and hitting search, it takes me to a blank screen with this address:

http://legacygt.com/forums/search.php?do=process

 

I tried it on different sub-forums, same result. Tried logging out of site, clearing cookies, closing browser etc.... no change. Started this week for me, not sure if others have same issues. Suggestions?