When I pop out the chat, it works fine for a while with the video taking up the entire screen, but after a while, this always happens. A phantom chat box that overlays over the video.
When I click the pop out button again, it'll reset the popped out chat window and be gone again, only to return after a few minutes.
Following that error, if I try to resize the window, the video will no longer be full window and instead be resized to the original smaller size with a bunch of grey area to the bottom and right side. Once the empty phantom chat thing appears again, the resize vertical bar will be there which I can drag around to resize the video. If I hit the pop out button on the empty chat, it'll return the video to full window size.
Running Windows 7. Updated Chrome Version 24.0.1312.57 m