Had this problem for 10 years...
If using a usb keyboard, plug it directly to usb computer port... not in a hub...
That caused me problem on my pc and on my mac. Now problem is gone !
When in browser in EZDrummer2, I cannot Drag and Drop a MIDI file clip in Cakewalk timeline as I've always do...
Only since last Cakewalk update...
Anyone ?