Winbox RC1 is available. There are lots of changes since beta 3* http://download2.mikrotik.com/routeros/winbox/3.0rc1/winbox.exe Overall highlights of Winbox 3: Two extremely needed features that would make winbox more productive and convenient: 1. "taskbar" for windows inside winbox. Now...

I would enable log for particular IPs/ports on mikrotik and tcpdump on target hosts and see what's going on. However I highly doubt it's mikrotik problem 'per se' as we did pretty complicated voice setups and mikrotik worked just fine. Check firewall rules or hire other MT specialist to do that for ...

so you want port11 on RB1100AHx2 to be directly connected to other router somewhere far away and basically use all this "RB1100+otherROS" setup as UTP wire? In this case you may use EOIP tunnel between two routers and add port11 on one side and port3 on other to the same bridge. Of course ...

you don't provide full info, however... it seems you are using ether5 as trunk port to your 1810 switch. If so, then: a) to simplify things, ether5 should not be member of any bridge, every vlan is added "on top of it"; b) wire from ether5 goes to trunk port 23 on 1810 switch. That port sh...

we lost complete vrrp config with 6.12 upgrade, it's simply gone.
also one router didn't boot at all, investigating.

so far crapiest upgrade ever.