With X1, it was possible to drag a groove from kitcore to Sonar, but this is no longer supported in X2. Am I missing some configuration settings or is this a bug?

With X3 I had to have it run as admin to get it to drag MIDI to a track. Hope that helps.

Thanks, Stevie!
That solved the issue with X2, too. However, running Sonar as admin is a workaround and could be a potential security problem. With X1 I haven't seen this problem, so Cakewalk should be able to determine what has changed.
=> IMO this is a bug that should be fixed in both versions, X2 and X3!