New
#11
Are you using a solid color background? If so try a picture and reboot (know bug)
If not try this registry fix:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
Then add the following value as a DWORD (32 bit) [if existing just edit it]
DelayedDesktopSwitchTimeout
change value to 5 and reboot
Hope this helps!