You haven't mentioned at all what you've tried (in terms of troubleshooting), so I would first ask if you have tried other browsers (or, what browsers is this affecting), and whether or not you have cleared your cookies and cache on the browser that you are using.
You also haven't mentioned when this issue came up. As Workfront usually deploys patches on a weekly basis, the end of the week is usually the time where users may notice this kind of behavior arise (again, clearing cache and cookies is the recommended first troubleshooting step).