Well from what I understand, yes, F@H uses a quorum to validate results. However I believe you get points for a completed work unit no matter what and don't know if your work unit was good or not. This is probably because a work unit with an error usually throws an EUE (Early Unit End), stops at that percentage, and earns you no points.
What I think you're experiencing, though I can't prove its true, is I've noticed a 6-9 hour lag in results getting reported that I hadn't seen when I first started. This could be on their end and its a technical issue that they have to solve, or it could actually be programmed that way. Anyways, when I stop folding, I usually keep turning results for the next 6+ hours and then it dies down. I always get the points in the end though.
I tried to install the new drivers and an hour or two latter managed to get my rig working again by uninstalling, cleaning, re-installing several times. 
Didn't want to screw up my crunching and folding ppd too much, so I put it on hold.
