Even if you are not able to spot an issue with the orbiter.log someone here might. We don't ask for the orbiter.log just for the fun of it so please post it.
Also, if printscreen doesn't work I'll suggest two other options:
1.
Gadwins print screen - Turns the printscreen button into what it's meant to be.
2. Snip - Application built into Vista and windows 7.
My number one motto is 'always assume that the fault is with the install or PC until evidence is presented proving it's the addon' and that goes for myself as well. I've found a few issues with addons that have always been down to my setup rather than the add on.