I just upgraded to Beta 3 this morning and now a number of my guest OSes power off on their own. I have four Windows Server 2003 R2 Standard and Enterprise Edition guests and one SUSE Linux 10.0 Guest running NFS and NIS.
This has happened twice since upgrading. I will be working on the console on one guest for fifteen minutes or so and when I finish I find that most of the other guest OSes are powered off.
Has any one else seen this? My host server is running a AMD Althlon 64 X2 4800+ with 4GB of memory on Windows Server 2003 Enterprise Edition. Build 22874 was quite stable and I have never had an issue with any guest until the upgrade to 23869 today.