If you are using any version of the desktop app and you see several lines of text in the upper left of every video (see example below), the "Display Playback Info" preference setting might have accidentally been toggled on. You can turn this feature on or off by going to the "Settings" menu item and then to the "Support" tab. At the very bottom you will see a preference to turn "Display Playback Info" on or off. Please refer to the frame grab below.
We have this setting to help troubleshoot playback quality issues.