If you are using windows, on the bottom right side of the taskbar, there will be an icon of Upwork time tracker, right-click on it to view the time tracker, preview attached below.
I hope this is helpful.
Could you please try exiting the App, then delete the folder %USERPROFILE%\AppData\Local\Upwork and then re-launch the App again. It will ask you to log in again. Please, let us know if the issue persists after that.
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