Or you could even call it “Long term”
No - because “previous-stable” would not be “longer-term” than “current-stable” as next “new-stable” makes “current-final-stable” to be “previous-stable” 
Version 7.18 has been released.
http://forum.mikrotik.com/t/v7-18-2-stable-is-released/182200/1
I know this is months old at this point, but did you ever find a solution to this that didn't include nuking the Interface/Bridge/Vlan config? I'm having this exact same issue with duplicate vlan entries and I'm not able to make any changes - I get the same "vlan already added" every time. The switch I'm working on is off site, so I won't be able to console to it if I kill my remote access to it.
I just now saw this, but in answer to your question, no. I had to wait until I got home and do it under a serial console. I deleted the vlan entries in the bridge config, then re-added them. This was a pretty ham-fisted update on Mikrotik’s part imo.