If you could give us the data from Chrome's versions page (chrome://version) and your pertinent system information (OS versions, what chip your mac has, etc.), that'd really help. Until then... it's doubtful that anyone can help you.
If you were to ask me, I would probably say something along the lines of, "some other people seem to be having similar problems, but I can't really tell if your problem and the others' problems are related because I don't have enough information."
But, as always, here's your basic troubleshooting: Try refreshing the page (cmd+r). If that doesn't work, try hard refreshing the page (cmd+shift+R). If that doesn't work, restart Chrome. If that doesn't work, try logging out of your Mac (Shift-Cmd-Q). If that doesn't work, try restarting you Mac. If that doesn't work, try reinstalling Chrome (and possibly restarting your Mac again). If the problem still persists, it's probably a problem with Canvas or you might have some malware stuck in your system. Kind of a fifty-fifty chance.