Dear Parallels Community, We need your support in resolving a very nasty problem. The info collected in this thread should show us whether we have fixed all possible kernel panic conditions or not and will let us get rid of them in the closest public version of Parallels Desktop for Mac. We really appreciate your help here and will continue to work hardly to bring you the best product. Please, provide us the following info on your Panics: 0. Short description of Panic condition (was it at VM power on, normal guest system work, or guest system software reboot, etc.). Is it possible to reproduce this Panic? Do you see any similarities between Panic conditions you observe? 1. Your Panic log. - Open Macintosh HD->Applications->Utilities->System Profiler - In the left tab find the "Software" group and select "Logs" - In the right tab find the "panic.log" - Save its contents to some text file and attach it to your post on the forum or just copy-paste to your post. 2. Your Mac memory size and guest OS memory amount. 2.1. Do you limit memory size to some value by "maxmem=option"? 3. Your CPU count. 4. Your Mac model. 5. (optional) Your system version (ex. 10.4.7:8J2135a ) 6. (optional) Your kernel version (ex. Darwin 8.7.1) If you feel ready to make some additional testing: 0. NOTE: Make sure to backup all important data on your Mac - Panics can damage your unsaved data and lead to data loss. 1. Does KP happen with VT-x option disabled ? (you can disable it by clicking Edit->Options and browsing to VM flags tab) 2. Does KP happen with "maxmem=2048" boot loader option ? 3. Does KP happed with "cpus=1" boot loader option ? Thank you in advance, Parallels Team.