Why can't a virtual machine that is part of a manual pool be started in a RHEV 3.1 environment?

Issue

• After powering down last VM from a maunal pool, cannot launch the VM again
• First attempt to start the VM again produces the following error in Event tab of the RHEVm Web Admin Portal:

Failed to start VM test-pool-1, because exist snapshot for stateless state. Snapshot will be deleted.

• The following can be observed in the engine.log:

2013-03-18 11:05:07,275 INFO  [org.ovirt.engine.core.bll.RunVmCommand] (ajp-/127.0.0.1:8702-3) [30c67f20] Lock Acquired to object EngineLock [exclusiveLocks= key: 3822c111-7780-49ad-a872-3dd27a505101 value: VM
, sharedLocks= ]
2013-03-18 11:05:07,309 INFO  [org.ovirt.engine.core.vdsbroker.irsbroker.IsValidVDSCommand] (ajp-/127.0.0.1:8702-3) [30c67f20] START, IsValidVDSCommand( storagePoolId = 26e0c9cc-864d-11e2-a83b-5254001c3744, ignoreFailoverLimit = false, 
compatabilityVersion = null), log id: 15f54b45
2013-03-18 11:05:07,311 INFO  [org.ovirt.engine.core.vdsbroker.irsbroker.IsValidVDSCommand] (ajp-/127.0.0.1:8702-3) [30c67f20] FINISH, IsValidVDSCommand, return: true, log id: 15f54b45
2013-03-18 11:05:07,371 INFO  [org.ovirt.engine.core.vdsbroker.IsVmDuringInitiatingVDSCommand] (ajp-/127.0.0.1:8702-3) [30c67f20] START, IsVmDuringInitiatingVDSCommand( vmId = 3822c111-7780-49ad-a872-3dd27a505101), log id: 145c6bac
2013-03-18 11:05:07,371 INFO  [org.ovirt.engine.core.vdsbroker.IsVmDuringInitiatingVDSCommand] (ajp-/127.0.0.1:8702-3) [30c67f20] FINISH, IsVmDuringInitiatingVDSCommand, return: false, log id: 145c6bac
2013-03-18 11:05:07,432 INFO  [org.ovirt.engine.core.bll.RunVmCommand] (ajp-/127.0.0.1:8702-3) [30c67f20] Running command: RunVmCommand internal: false. Entities affected :  ID: 3822c111-7780-49ad-a872-3dd27a505101 Type: VM

• Consecutive start attempts show different (pop up) error message via the Web Admin Portal:

Error: test-pool-1: Cannot run VM. Related operation is currently in progress. Please try again later.