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Testing the tanks in Monster is actually on my to-do list just to see if it's resolved. We haven't been running it though because 1.6.4 has the zombie pathing bug and every time we try it we end up with hideous block lag from zombies eating up more than 50ms per tick.
Update:
No crashing in...
It doesn't look like you have to go far. We were able to log in 16 blocks away from the tank while staring right at it. Just so long as there isn't a single tank block within the chunk you spawn in.
Do you have any Railcraft iron tanks?
I was having exactly the same problem right down to an identical stack trace.
I narrowed the problem down to the iron tanks in the basement of my building. They were somehow causing the client to crash if I logged into the server with my character in the...