I don’t know what was changed.
But upgraded 6 routers that I manage 2 days ago and works fine so far.
To get 64-bit kernel with 3.8.2 you have to:
Upgrade 3.8.1 –> 3.8.2
uninstall 64-bit kernel
install 64-bit kernel (now in right slot!)
change kernel choice in boot menu slot, save.