WinXP under Parallels on my iMac.
Tried dropping back to WD build 63 full-install and had the same issue. One strange thing is with build 64 I had to manually kill MovieMaker. I thought that might have been an issue as I know Brian made changes to MM, but didn’t seem to make any difference.
I just checked D4 and it shows the last update was +30 seconds. I tried different servers, currently using “now.okstate.edu” but every server shows the same affect. As soon as I shutdown WD the time stabilizes and updates in D4 show more realistic time updates in the +0.05 to +0.09 second range.