I have repeated the wake from sleep spontaneous reboot a few times to make sure it wasn't my imagination It could be anything, usb device waking up, time machine backup running after waking... At least that is what is happening when the vm is coming online just before it reboots on mine. I'll look at it more tomorrow.

As a cheap work around you can:

sudo /Library/Application\ Support/VMware\ Fusion/boot.sh --restart

and it wont reboot your machine when you power on a vm after waking from sleep. But having to remember to always do that is annoying.

I'm using a 32-bit Windows XP SP3 VM, created with a slipstreamed SP3 installation CD under VMWare 2.0 beta 1 (now upgraded to beta 2), and I'm getting the instant reboots on my one month old 8-core Mac Pro running 10.5.4 patched up to date.

If I put the system to sleep with the VM running, waking from sleep goes almost immediately to a restart instead of resuming (after a few seconds delay with a blank screen, which is presumably while it's waking from sleep then triggering the restart). If I suspend the VM and put the Mac to sleep, it seems to wake from sleep correctly and operate normally, but when I later attempt to resume the VM, I immediately get a restart as mentioned above - no kernel panic, no diagnostic logs... just a sudden blank screen and reboot.

In both cases, after the reboot, the VM is in a "powered off" state, which suggests it did actually resume and change state before the host machine restarted.

I'm happy to run further tests if needed, as time permits.

Interesting!

What network mode are you all using (NAT/Bridged/etc.)? What version of OS X?

I will go through the boot.sh as you outlined this evening and see how it goes and post my results. Thanks!