Do you remember to what version of oVirt you upgraded the 4.1/4.0/3.6 cluster?
It sounds like a bug we had (relatively long time ago) that lead to having duplicated unmanaged devices.
Can you please check in the VM devices tab if you have unmanaged network interfaces? if you do, it was reported that running the VM in run-once mode would clear those devices (but you can also remove them from the database as well).

On Wed, Aug 22, 2018 at 1:38 PM <daniel@djj-consultants.com> wrote:
I also tried to export (work) and re-import(work) the same VM and try to start the imported one with the same result that it didn't start
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