I'm having the exact same problem using the TM 2300 with the Linksys wireless-g usb adapter.  When I restart the computer the wirelss network appears to be running at normal speeds, but I get no internet access.  Only when I go to network connections and disable the adapter and then re-enable it does the network show the assignment of an IP address and the internet begin to function.  Very annoying.  Anyone have an idea if there is a setting that can be adjusted to fix this?

tHANKS.

I called linksys customer support about this issue.   Although they were very courteous and willing to help, they didn't have a solution to the problem.   They had me try a variety of things (different settings, re-installing, etcetera).  They finally suggested that I take it back to Best Buy for an exchange.  I don't think that would do any good so I didn't do it.   If another manufacturer comes up with a similar product in the near future, I will probably try to exchange my linksys adapter for it.  Are there any such similar products (external USB 54g adapter?)

Reinstalling the adapter and software did improve the speed.  Before, it was stuck at 1Mbps.

Did you ever figure this out?  I'm having the same problem with a desktop.  Says that the switch is not turned on.