Clients not getting patches: No Wuahandler.log

Hi

Clients under primary sites are not receiving any patches (Software Updates). Software distribution works across the board. The deployment works well for the clients under the central site. When I do a Scan Cycle nothing at all happens in Wuahandler.log (it should say that a scan has been initiated). Everything is set up correctly (I've double and triple checked). This happens for all clients in all primary sites (4). Any tips?

Computers show as Unknown in the update list, but if I reinstall the client and delete them from the Collection "All Systems" and reapprove them when they appear again, they will update with what patches apply to them. No errors in WindowsUpdate.log, it shows the correct . The only thing happening when I do a scan cycle is that ScanAgent.log tells me that a scan request has been added.

Thanks