Hi,
jumping by more than one minute into the future can occasionally confuse software that is built around a wallclock-based timer queue, which apparently is the case for the DP IPC. That being said, if you are NTP synced and that is working properly (in a Windows domain it usually should, I've found that non-domain-members use a way too relaxed polling though, something like once a week, which easily allows them to drift away like crazy), e.g. when you really poll within 1200s, you should never accrete a drift of that size, unless there is something external messing with your clock. The first guess would be the VM is configured to sync time from its host (in VMware tools), and the host is free-running and drifted away by a minute.
Watch your clock using w32tm /stripchart /computer:my-ntp-server to see what's going on.
HTH,
Andre.