Hi all! I don't know since which Firmware my WRT54GS V1.0 does that, but at the moment I have Thibor's build "Hyperwrt_GS_4.70.6-100905-final.bin" flashed. I pushed the reset button before and after flashing the firmware. If I enable the UPnP switch in the router setup, Windows stops responding and shuts down immediately. This does only happen with the cable connection (could only fix it via wireless access to the setup). Does anyone else have this problem and how can I solve this? Thanks for your help!