vdiagent.log has errors like this:
[E 0B/00000011/T0BEC/P0F3C] 03-09-21 15:48:42 - Guest agent at aaa.bbb.xxx.xxx is already in use by VDI Agent at ccc.ddd.yyy.yyy.
There is more than one RAS farm connected to an instance of vCenter.
There are two possible solutions:
- (recommended) Use a dedicated resource pool for each RAS farm;
- Configure 2XVDIAgent registry key for VMs and templates from both farms: http://kb.parallels.com/en/124157