WOW....REALLY??  After all this time and some hope that people may forgive Chris Brown, he strikes again!

Chris Brown exploded in rage behind the scenes at "Good Morning America" this morning ... smashing a window and storming out without a shirt ... sources tell TMZ ... and it was triggered by on-air questions about the Rihanna incident.

Check out the video of Chris's Interview here, would you be upset by the questions if you were him?

BC sources tell TMZ ... Brown performed and was interviewed by Robin Roberts live from the Times Square studio when she began asking about the infamous incident.

Brown tried to redirect the questions to focus on his album -- but Roberts continued to ask about Brown's legal issues stemming from the Rihanna incident.