I installed the 21905 Cookie Release 1 earlier today.
I too am having the sense tabs that are not re-arrangeable issue.
I also noticed something else, and am curious if it's just me.
When using WinMo's messaging for looking at SMS or e-mail. I cannot select any 1 item to actually view it. It gets highlighted, but I am unable to open it.
Tapping on the SMS from sense works through that interface, but no WinMo.
So SMS technically works, but e-mail is effectively useless.
Am I alone?