Hi. I gather there've been more than a few headaches getting working video drivers for the ATI 4850 in the iMac (windows side). A few posts have said that version 8.661 of the AMD driver (Catalyst 9.10) works, but other versions including newer ones, don't. Anyone able to confirm if this is still the case? More specifically, has anyone tried to install the latest Catalyst Mobility Display Drivers (10.6)?