Hello When try to switch to Parallels Coherence mode under WXP, it shows the following message in a box: Unable to switch to Coherence Mode. Primary operating system does not support screen resolution requested by guest operating system. Select another resolution for the guest operating system or review your video system configuration. I am running a MacBook (1st gen) with 2GHz and 2GBytes memory. Attached is a 2nd monitor (17" tft, 1280x1024). I've already tried all kind of different resultions. Any ideas? Thanks for your help! Regards, Jochen [UPDATE] Unpluggingg the external monitor helps. Any ideas how to work around that?