QUOTE(wicked @ 12.08.2008 21:34)

where are you updating from your adminkit or KL update server (internet)?
if you are updating from adminkit and still it shows old signature in your workstation, better check if adminkit is updating properly, update adminkit manually, click download updates.

I have them set to use the adminkit server first and the intardnet as a second choice. Most of the machines are getting the updates just fine, I have about 8 of them that are not. I have tried running the update task from the adminkit, it says it worked, meaning the task completed successfully. I have tried it from the client (got that fixed by following this thread) and it shows all green (with the few light blue informational log entries), but as soon as the job finishes it reports that the definitions are out of date (they all show 7-24-2008 right now if that means anything).
I'm lucky that one of the machines exhibiting this behavior is my laptop, so i can be more aggressive with trying things. I have removed and reinstalled KAV-WKS more than once, it fixed two of them but the other 8 are still a problem, I've done it four times now on my laptop to no avail so I decided that wasn't it. In fact i reinstalled the client across my enterprise last week using the instructions in this thread, so I don't think that is the issue. The workstations (not my laptop) are all the same brand/model, built using ghost images, so I don't think there's any hardware/firmware issue either.
I just figured there was some article here about clients that were not receiving scheduled updates but haven't found it.