I've been periodically attempting to merge two tags over the past ~3 weeks - as per the discussion in this Meta question - but have been unable to do so. The first few steps of the merge process work alright: I can select the two tags, and the merge preview gets pulled up correctly, but when I hit the button to actually perform the merge, I get kicked out to the Something Bad HappenedTM page.
Additional information that appears to possibly be relevant: there was a synonym suggestion awaiting approval that was going to map clockworkmod-recovery to clockworkmod. This is the opposite of the merge we were trying to perform, so I'm suspecting that it was causing the system to bomb out because it couldn't reconcile the attempted merge with the synonym suggestion. I was able to complete the merge by doing the following: