Format colors are showing correctly in preview, but not in Win10 taskbar

[bongosmurf]

Hi,

when I first installed Timekeeber, this was not an issue, but a couple of weeks ago, I noticed that there was no longer sufficient contrast to be able to read the date/time in the taskbar. The preview and hover-pop-up are fine on the other hand:

Changing the character color does work, but does not improve contrast in the taskbar.
Changing the background color or toggeling transparency does nothing in the taskbar.