Icon in tray is empty

Win10. After installing v13.11 as an upgrade to v12 it all went well except now the icon in the tray is missing or blank. I did do a system restart twice. How can I get the icon back? Here is a picture, the arrow shows where it used to be
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Try toggling Preferences / Launching Opus / From the Taskbar icon / Add icon to taskbar notification area.

If it’s the main taskbar button, unpin it, then open Opus and pin it again. That’ll probably fix it.

Thanks Leo. I unpinned the blank icon and the Dopus icon appeared from underneath the blank, I guess it was masked by piled up icons, some installation buglet maybe.
Then I quit Dopus, the icon disappeared, I re-pinned it by dragging a shortcut to the task bar and now all appears to be good.

It's a bug in the Windows taskbar. Has been there since Windows 7 introduced the new taskbar.