I have the same problem. Driving me crazy i can't fix the skin to change the Clock. Skinstudio doesn't obey, or the skin doesn't and can't change the font ,size or color of the Clock in taskbar. Also fluctuate back and forth both in White and blue. (suppose to be constant White color) Also date is visable now when it suppose to only show the Clock and not the date when using small taskbar as i Always have it on. Somethings are messed up on the Anniversay update.
This problems didn't exist on former win 10 1511 10586 version which worked perfect with the skins.
I only have one monitor.
taskbar button text setting yes i tried that to but Clock won't change in the skins atleast for me.
Hope this gets fixed soon.