WebUI "invalid request" error from /gui/?list=1 but not /gui/

[staedtler]

I'm running WebUI in uTorrent 2.0.2 on Win7 32-bit. I've fixed the WebUI port to 8088, which is being forwarded through my router. There are no whitelisted or excluded addresses.

I have no problems accessing the WebUI from anywhere on the Internet, as long as I go to http://example.com:8088/gui . But when I go to http://example.com:8088/gui/?list=1 , I get "invalid request". I've tried using Firefox, Chrome, and the Webkit browser on my cell phone, but the problem is consistent.

Thanks in advance to anyone who can help!