Network inspection when behind proxy

[c69]

When you are behind (NTLM) proxy, Opera and Dragonfly behave very weird..

Opera is not loading some resources, and when you try to debug them - you see nefarious "No request made. All data was retrieved from cache without accessing the network" which is displayed for all request - successful or not.

This is extremely annoying when trying to understand, why do you get "Linked script not loaded" error, even when this same script is perfectly loaded in nearby tab.

Also, setting "disable all caching" changes nothing.
Clearing cache via delete private data, or force-reloading does not help.

Also, resource inspector stops working correctly.

System is WinXP SP3 32bit, NTLM v2 auth, all the sites im trying to inspect show the same useless results in network inspector (intranet, google, wikipedia, opera.com).

Possibly this is a core bug, and not a bug of DF, but at least there should maybe be some different text ?