My Core 2 MBP was updated directly from 1940 to Beta 3, whereas my iMac was updated from 1940 to Beta 1, then Beta 2, then Beta 3. Aside from a BSOD on the iMac when going from 1940 to Beta 1, Coherence has worked stellar on it. However, my MBP is another thing. Coherence just didn't work, even though I'm certain I'm doing everything correctly.
So, digging around a bit, I've found the solution. Here's a confirmed fix:
Launch Parallels, and start Windows.
Click Start menu, select Run...
Enter the following in the Run dialog box (this will stop the Coherence service and remove it from the service list...it doesn't actually delete the program, so fear not):
Reboot Windows
Click the Start menu, select Run...
Enter the following in the Run dialog box (with quotes):
Code:
"c:\program files\parallels\parallels tools\cohrence.exe" install
Seems Parallels has a typo in their executable name (note the misspelled cohrence.exe file)