Since app update

Since the last app update (4 days ago) unable to live stream any camera. Worked fine until upgrade. Captures motion and sometimes plays it back but will not let me watch a camera live. Huge update 76 mb.

Welcome to the community!
Have you tried doing a factory reset on the camera?

Along with the App update, are you on the most recent Firmware? Check under Device Info/Firmware Version. I believe for aV2 the current is 4.9.6.97.