I don't think the trial delay had anything to do with a possible plea deal. This judge is the hardnosed type who has consistently pushed the trial forward. I'm sure his attitude would be "you should have discussed settlement before, not during trial time" and unless they are 99% of the way to a deal and some extraneous factor (outside of the Justice Dept and the defense) it holding it up no way he would stop the trial.
My guess is something happened with the jury-like some juror watching TV about the case, discussing it with someone, etc. Alternatively it could be about a potential mistrial motion by the government due to the judge's now admitted multiple mistakes and his clear bias against the government demonstrated in front of the jury.
Whatever the problem it is probably pretty serious since the judge couldn't solve it Friday. Monday will be interesting.