Apache WM6.1 19213 No sync with WMDC6.1 x64

[mrgino]

Running Vista x64, WMDC6.1 x64.
Sync worked fine for months with WM6.

Just upgraded to WM6.1 via kitchen.
Sync no longer works via BT or USB. WMDC does not see device, but computer does (appears in device manager).
For testing purposes, the phone will sync with ActiveSync 4.5 on my XP SP2 machine, but the Vista machine is where the sync is needed.

Tried with just a very bare stock rom, still no luck.

I've been searching for the past 4 or 5 hours on these forums as well google to no avail. it seems that others were having this problem as well but none have found the solution (or havent shared it at least). Is anyone else experiencing this problem? Any leads on a fix?