I have had this same problem for 2 days on both Chrome and Explorer. I can log in to my account online, but once there nothing seems to work. The only thing that is clickable and functions is the "7 days" sorting option. I cannot edit any of my existing tasks, and clicking on any of my projects does nothing. Even the "Settings" gear icon is static - so I can't even log out.
I've restarted everything multiple times (computer, browser, etc.), and emptied my cache. Not sure what else to try. All of the other websites I go to within the browser function just fine.