wifi signal strength no signal

Since installing Beta 5456 the signal strength icon has started claiming "No Signal" even though I have successfully setup a wireless connection and connected OK to the Internet. If I disconnect the network, the WiFi connection appears in the list and the signal strength is shown as excellent (5 bars). If I then select the connection and click the "Connect" button, Vista shows the acquiring IP address dialog; then says I am connected but with "limited connectivity". At this point, the signal strength is showing as "No Signal" again. Despite this, I have a good connection to the Internet (confirmed by the network map).
Is this a known problem / bug? It was working OK in the public Beta 2.
NRM Smith

The happened to me with the prior release (all I can get). Happened after an automatic update to my Intel 2915abg driver. I rolled back and it fixed it.
"nrms" wrote in message

Since installing Beta 5456 the signal strength icon has started claiming "No Signal" even though I have successfully setup a wireless connection and connected OK to the Internet. If I disconnect the network, the WiFi connection appears in the list and the signal strength is shown as excellent (5 bars). If I then select the connection and click the "Connect" button, Vista shows the acquiring IP address dialog; then says I am connected but with "limited connectivity". At this point, the signal strength is showing as "No Signal" again. Despite this, I have a good connection to the Internet (confirmed by the network map).
Is this a known problem / bug? It was working OK in the public Beta 2.
NRM Smith