I just got off the phone with support and they indicated that this appears to be a timing issue. Because of the number of groups and policies you have(I have 150 locations globally, each with a separate group and LU policy), when you query the database to enumerate the "Location Use Count", it times out producing that error message. Per support, try the following on the SEPM you are trying to connect to (if there is more than 1 SEPM, you will need to perform the steps on each one):
1. Click "Start-->Run" and enter services.msc. Press Enter.
2. Disable the "Symantec Endpoint Protection Manager" service.
3. Click "Start-->Run" and type "%temp%". Press Enter.
a. Identify a file called "sesm.xml" (it is hidden, so make sure you can view hidden files).
b. Change the value for "login locationCounting" from "True" to "False".
4. Start the "Symantec Endpoint Protection Manager" service.
This procedure prevents the console from identifying all the locations where the policy is applied. This issue may be resolved in MR4 MP2, but I have yet to get confirmation on that.
Chris Tyrrell
Creative Breakthroughs, Inc.