HBO Max App

I’m signed in to HBO max app through xfinity, X1 box. Content appears to be all there. I select a video and it progresses to next screen, however the video never starts. The video title is in upper left corner and the progress bar is visible. But, progress bar is not responsive to any remote commands. Except for video title and progress bar, the screen is black. Peacock, prime, Netflix all work fine through the xfinity app function. Thoughts?