I got the info back.
Went to add tracks and didn't add any but just went back to the timeline.
Glad that you got it back.
While the cause could be somewhere else, when I see a GUI display issue, the first thing that I check out is my video driver. I would go to your card's mfgr's. Web site, and see if there is a newer driver available (do not trust your OS, or any utility, to tell you - check on the site), then download, read the installation directions, and finally install the new one, reboot and test.