Gaak. I've spent hours on this new version... First, Roxio wouldn't uninstall or reinstall properly - and it takes SO long to watch it fail each time. I finally had to manually remove the detritus that uninstall left behind, run Windows Installer Cleanup utility, scour the registry manually to remove Roxio stuff, and manually delete the sub directories left behind. Add in a few more reboots and then finally a successful reinstall.
Now - with the new DM in place, I'm finding that the first thing it always wants to do is "Check for device application updates. Please wait...". This seems to take several minutes each time - I can't imagine what it's doing... It even offers a tantalizing "Cancel" button - but this, like everything else, appears disabled right now, so my choice is to wait and watch with fingers crossed, or kill it with Task Mangler and try again.
Never had problems like this with any prior releases, including the 4.6 and 4.5 betas...