Chris Brown -- Judge Revokes Probation in Rihanna Case

Chris Brown is in trouble ... again. The judge in the Rihanna beating case has just REVOKED his probation because of the fresh assault charges filed in Washington D.C.

Brown was in court for a progress hearing. The judge felt the criminal complaint in D.C. is enough proof that Chris did NOT obey all laws ... which he's required to do while on probation

The judge did not remand Chris into custody, because hizzoner was impressed by Chris' progress in his anger management rehab. The judge will hold a hearing on the matter in February, and it's possible he could sentence Chris to time in the pokey.

The judge also ordered Chris NOT to use medical marijuana for the time being.

TMZ broke the story ... Brown was popped in Oct. for felony assault -- later reduced to a misdemeanor -- and the L.A. County Probation Dept. launched an investigation.

We just got hold of the progress report (above) -- filed with the court -- from Chris' anger management program. According to the document, Brown participates in a weekly boot camp and successfully completed a 12-hour ropes course "to enhance team-building skills and trust."

The clinical team says Chris has been making progress and has new psychotropic drugs that seem to be working. He's been taken off medical marijuana. The team says his ability to "emotionally regulate himself" has markedly improved.