Hello,
In our experience we had strange problems with vlans and rstp, only when we switch this options off device is working, when we used same setup, only seperated poe sistem with rstp option on it works?
Has anybody had simulare situations?
tnx.

I have a similar problem with RB260GS, but not quite.
I have ports 2,3 untaged vlan 10, ports 4,5 untaged vlan 20. If I connect ports 2 and 3 with a patch cable, the device almost immediately becomes unavailable (broadcast storm obviously). But if I connects ports 2 and 5 - RSTP works as it should and marks port 5 as backup. It looks like a bug and I will report it to Mikrotik.