[ovirt-users] Cannot assign VM from Pool having still unassigned VMs

Hi, We're running oVirt 3.5.3.1-1. We created a pool of 25 VMs. Currently, there are only 15 assigned, however, one of our users is trying to assign himself a VM, and the following error is being thrown: Cannot allocate and run VM from VM-Pool. There are no available VMs in the VM-Pool. I can still see VMs with no assigned permissions. In logs I can see the following: 2015-11-17 08:06:02,257 INFO [org.ovirt.engine.core.bll.AttachUserToVmFromPoolAndRunCommand] (ajp--127.0.0.1-8702-24) [17ea41ff] Lock Acquired to object EngineLock [exclusiveLocks= key: e03acf2c-baae-48f5-af8c-c88e9e0737ae value: USER_VM_POOL, sharedLocks= ] 2015-11-17 08:06:02,275 WARN [org.ovirt.engine.core.bll.AttachUserToVmFromPoolAndRunCommand] (ajp--127.0.0.1-8702-24) [17ea41ff] CanDoAction of action AttachUserToVmFromPoolAndRun failed for user XXX@YYY. Reasons: VAR__ACTION__ALLOCATE_AND_RUN,VAR__TYPE__VM_FROM_VM_POOL,ACTION_TYPE_FAILED_NO_AVAILABLE_POOL_VMS,VAR__ACTION__ALLOCATE_AND_RUN,VAR__TYPE__VM_FROM_VM_POOL 2015-11-17 08:06:02,276 INFO [org.ovirt.engine.core.bll.AttachUserToVmFromPoolAndRunCommand] (ajp--127.0.0.1-8702-24) [17ea41ff] Lock freed to object EngineLock [exclusiveLocks= key: e03acf2c-baae-48f5-af8c-c88e9e0737ae value: USER_VM_POOL Any hints, please? Thanks.