All the front-ends are showing 0x4000 status and have lost communication with the frame builder. It looks like the timing skew is back again. The fb is ahead of real time by one second, and strangely nodus is ahead of real time by something like 5 seconds! I'm looking into it now.
I was bad and didn't read the elog before touching things, so I did a daqd restart, and mxstream restart on all the front ends, but neither of those things helped. Then I saw the elog that Jamie's working on figuring it out.