Add me to the list of idiots... froze a keg of Belgian Pale Friday evening. The 4912 was acting finicky. I tried to keep it at 40F to please all crowds; e.g. cold enough for BMC folk, but not too cold for me - I let it warm to 45 or so and drink. Anyway, normally it held just about 42 or so where I had it set, but temps are starting to increase here and it was pushing 45-50. So I turned it up one notch. Frozen beer, not good. At least I learned (too bad the hard way) how touchy the 4912 is, I'll leave it where I had it before, haha...
Anyway, the kegs look fine from the exterior and I've had the kegerator turned off for a few hours to let it thaw. It's now slush I believe from shaking the keg... we'll see what happens I guess.
Glad I removed some Belgian bottles (Lost Abbey) I had in the back behind the kegs - that would have been a mess.