I"m having also some issues. Vista worked ok for a while and now I can connect to certain sites only and partially others (like microsoft.com) Page starts to display and stays there whithout even a timeout. Some sites, no problems. I've tried Firefox but still same. I have disabled all security features of Vista/IE7, removed SPI from my Linksys RV042 still same problem. Checked rules, nothing other than default settings. So I took the long route, formatted and re-installed...Guess what? same problem. What's weird it I have changed nothing on my network/computer/router and suddenly stopped!!! Guess until we can put our hands on a newer built (other than 5384), nothing much can be done.

Update!Its working now but...Had to totally disable the firewall in the RV042. The KB update didn't fix my problem and removing the SPI didn't either. So it has to be a special rule in the firewall that needs to put there. Any ideas so I can reinstate my firewall?