Searches of the Parallels Desktop for Mac forum has come up dry on this topic. First, my config: MacBook Pro 2.16 GHz Intel Core 2 Duo 2 GB 667 MHz DDR2 SDRAM Mac OS X 10.4.8 Parallels Desktop for Mac release 3170 RC3 - running single VM - Windows/XP in 256 MB of assigned memory Problem: 3170 RC3 running fine. Several apps (Microsoft and 3rd party) run fine. Maximizing or Minimizing app window works, but if I grab corner or edge of application window to custom resize it, XP crashes immediately (and reboots). The install of Windows/XP is from distribution CD that ran on a heavily used Dell Inspiron 4000 laptop for near 6 years now, and never showed this problem. Has anyone seen this? Is there a workaround? A fix forth coming?