Are you dropping into an existing track?

Wow, I just rolled back to Gloucester and it doesn't work there either now. X3 still works. Gloucester USED to work. I'm on windows 10. Could it be one of the many updates? Is your computer on 10 with all the latest updates?

Yes I'm dropping it onto an existing track. I just took it back to Hopkinton. Same behavior.

Does the track have a mono plug-in or mono interleave?

No its just a stock Stereo track. I've tried importing it to various types of tracks, even a midi one to see if melodyne would respond. Nothing. Just errors. I'm pretty sure that I dragged a file onto a track in Hopkinton a few days ago and it worked. Something has changed recently and I can't put my finger on it. Just windows 10 updates. Hmmmm.

I am not on Win10. Try rolling back the Win10 updates.

Hi. I can not replicate on laptop or studio pc, using Win 10 and SONAR Platinum Hopkinton on both.

Just went through the longest system update on record only to find that the problem still persists. I'll have to check things out again tomorrow. Weird problem. I really can't get any work done as I do a lot of editing of files that I can't import.
 
To be continued . . .

Try using the browser to find the file (as in navigate the browser to the file location and then drag from the browser). I don't think I've been able to drag and drop for as long as I can remember but the browser method works fine.

Grum.

Just tried the browser for the first time. No dice.