I am pleased to say the next update of Start11 which should be released soon will resolve it.
In the short term you can fix this as follows :
Go to
HKEY_CURRENT_USER\SOFTWARE\Stardock\Start8\Start8.ini\Start8
using Regedit and then add a new string value called AllowWinKeyFix and give it a value of 1 and then sign out and in again.