I want to cut over other ports to this new vlan, but when I set the PVID for the ports, it didn’t work smoothly. I reverted and and set the PVID back. Still, devices didn’t ping. I ended up rebooting the switch after about 32 seconds (STP was off for this test).
[admin@ccr2116] <SAFE> /interface/bridge/port set pvid=462 0,5,6,7,8
[admin@ccr2116] <SAFE> /interface/bridge/port set pvid=364 0,5,6,7,8
[admin@ccr2116] <SAFE>
[Safe Mode released]
[admin@ccr2116] > /system/reboot
(Box is layer 3, and my OSPF sessions stayed up, even through port 0)
Not looking for a full analysis, but asking if other people have seen weird issues with Mikrotik Bridge when changing PVID. I took the reboot opportunity to go from 7.10.2 to 7.11.2. 
[admin@ccr2116] > /interface/bridge/print
Flags: X - disabled, R - running
0 R name="LOOPBACK" mtu=auto actual-mtu=1500 l2mtu=65535 arp=enabled arp-timeout=auto mac-address=BE:14:C4:01:66:3B protocol-mode=none
fast-forward=yes igmp-snooping=no auto-mac=yes ageing-time=5m vlan-filtering=no dhcp-snooping=no
1 R name="bridge" mtu=auto actual-mtu=1600 l2mtu=1700 arp=enabled arp-timeout=auto mac-address=48:A9:8A:A2:71:4D protocol-mode=none
fast-forward=yes igmp-snooping=no auto-mac=yes ageing-time=5m vlan-filtering=yes ether-type=0x8100 pvid=1 frame-types=admit-all
ingress-filtering=yes dhcp-snooping=no