@Neil Banfield, I was about to reply to the same effect, i.e. I had Curtains installed long before Start10 and the tTaskbar was styled correctly.
Just carried out a quick test of installing Start10 and then uninstalling whilst the Curtains theme was enabled with the following result:-
- Before Start 10 installation taskbar style OK
- After Start10 installation still OK,
- After uninstalling Start10 the taskbar styling i.e. background image, was gone
Re-applying the style makes no difference. Re-installed Start10 Trial and taskbar styling back again.
@Basj - Windows10 21H1 Build 19043.1288 No updates in last few days.