Hi @Jon Mercer ,
Is this a suddenly occurred issue?
Does this affect other applications running on the machine?
Please try signing out via the upper right corner and then sign in again to see if there would be any difference:
If the white bar issue persists, it's recommended to clearing the client cache using the steps below:
- Close Teams, go to %appdata%\Microsoft\Teams, you can do this by directly copying and pasting it via Start and hit Enter.
- Remove all the content inside the Teams folder.
- Restart Teams.
In case it still doesn't work, it's worth trying to remove and then re-install the Teams application.
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