Same Problem! My Bold has stopped working with all wifi routers.
It connects just fine and draws an IP address from the router but cannot see the Internet. The name of the router appears on the top, but the WIFI symbol is grey.
On the connections list, when WIFI is checked, the name of the network is bright green, but there is no green check on the right, just a white dash.
The advanced diagnostics don't indicate that anything is wrong. The DNS test works, but the Ping test fails.
This started happening just a few days ago. Before that everything was just fine.
When the Data is On, I'm pretty sure that it's drawing data from the 3G network, not my router.