For some reason I've started getting "Chosen personality not available" messages appearing on the control panel of HP printers (CP3505, 3800) which have been working for donkeys years prior to this. I've been using the Universal Driver but have also tried the PCL 5/6 drivers with the same result. The only solution I've found so far is to try a different driver......Done that, what next!?

Running Windows Server 2008 R2 with Windows 7 x86 clients. both x64/86 drivers added to the server.

Anyone else seen this message or have any other ideas?