I've been having an issue for a couple weeks now where I can use my default browser when connected via WIFI, but no other programs that need access to the internet will work. So Google Talk, Market, Youtube, etc. don't work.
Also, when using the browser, I'm constantly getting certificate errors.
Has anyone else experienced this? I'm using CM7 Gingerbread edition, and I might roll back to Froyo and see if it helps.