Hi,
I'm a teensy bit late with this, because I just registered with the forum this afternoon or evening. Two comments on the VRDB:
First, if I know I can spare the computer for a bit, I sometimes like to "force" a VRDB update immediately after doing a disk scan (assuming it came up clean, of course) -- especially if I've recently installed and/or updated quite a bit of other stuff. That way I know I've got a VRDB that's clean AND fairly up to date.
And to expand slightly on Vlk's comments about computer activity, I'd originally assumed that the update would need a fair bit of inactivity, essentially long enough to "do its thing" in one pass. But apparently when it's time, it's quite happy to grab a few seconds here and a few there in between whatever else you're doing, until it's finished.
Best,
Mike