I imagine this is a new VM created from scratch when already in 3.4, correct?

If I remember correctly 3.1 form ovirt repos was not available for CentOS 6.x, correct?

So what was your upgrade path? Did you come from Dreyou repo and then updated from Dreyou repo for 3.1 to oVirt repo for 3.4?

Did you verify if any package from that repo still remained and for any reason create inconsistencies with current environment?

Just guessing ...

Gianluca