Hi Cleve! The most likely issue is something interfering with the browser display of the tab. You could test by loading the game in a private browsing window, which disables most extensions. You could also test on Firefox, to see if the issue repeats there. That would help narrow down the cause. If this were a universal problem with the Roll20 code, the forums would be flooded with reports, since that's pretty vital functionality. Other things to try would be deleting cache and cookies, and probably restarting the browser.