After reading on the RIM support site it looks like there may be some changes to the firewall preventing the access to the WIFI ports. I have attached one of the documents for you to read . Maybe you can see if it will help you to configure your BB.
The port numbers shown on the document are not the ones being used by Gmail or Facebook to force the cell data use vs. the WIFI so be careful. The implication is that blocks are placed by some applications to limit WIFI access. Now if anyone can answer why, that would be a good reply. I would suspect the carriers are trying to force data use and rack up more charges on people who have limited plans. http://www.blackberry.com/btsc/searc...1569&stateId=0
Also , Welcome to the Forums