A few questions:
And are you sure it's VRDB that's causing it? I mean, does the VRDB generation really starts when the Screen-Saver appears? If you set "Disable VRDB generation", the problem goes away and the screen-saver works normally?
I admit I'm not much into screen-savers... so can you tell me what "Eddy's tractors" is? You don't have avast! screensaver set, right?