No proxy here, just cable modem --> DIR-655. The flash update to 1.35NA went through flawlessly the first time around but I'm willing to give it another go.
The only thing I can think is that it didn't like restoring the backup of the settings from when the router was at v1.21 that I restored after updating to 1.35NA (although all the other settings seem to be working fine, port forwards, etc).
The other thing I will mention is that the "Apply Advanced Port Filters" option works fine but the "Apply Web Filter" has no effect.