I'm not sure if this is a Cakewalk Sonar Platinum issue, a problem with EZKeys, or both.

Recently, NONE of the Variation 1 song blocks of any song from any EZKeys MIDI Library, will not copy/paste or allow it to be dragged into the Sonar sequencer timeline.  Variation 1 MIDI song blocks can be dragged into the EZKeys timeline, but NOT into my DAW.  (All the other variations work okay)
This problem started happening within the last couple of weeks, and I'm still using the November release of Sonar (it worked okay with that version in the past)
I also posted this issue in the Toontrack forums, but since the problem only occurs within Sonar, I don't think the issue is solely with EZKeys.


Anyone else experiencing this problem? Any suggestions on what to try?

Try downloading and installing those midi files again. It's the quickest way to check if a file has become corrupted.

I have just tried on my system which is is on the December release of Sonar and EZKeys is fully up to date and all of the variation 1 can be dragged and pasted in to the Sonar midi track.  
 
What version of windows are you on?