Reading the forumtopics, it seems that this problem is occuring with a lot of people.
I already reported this problem in de "Graphics Card" topic but as the output to multiple screens is (imho) the most important feature in Resolume, I started a new topic to keep it a bit clear!
The problem: No output on 2nd monitor/beamer/screen.
Only when running the interface and the outputscreen on the same monitor it works.
Also... if you move a WINDOWED outputbox a littlebit to the 1st screen so that 99% is on the 2nd screen it also works... but hey.. that isn't normal isn't it?
PC specs: AMD athlon 64 X2
OS: Windows XP pro
Graphics: NVidia 7600 GT --> tried it with original Nvidia drivers and also the Omega drivers.. Same result.. No output on 2nd screen!
Before installing Resolume 3 nothing was changed to my PC config... When running Resolume 2.41 it works like normal...