Drag and Drop file into text editor not working

[Moy]

Till this moment, I only find mp4 file would occur this behaviour.

And some times even just select ONE file (and open preview pane) dragging could fail.
For other files - I tried mp3/wav/avi - It's OK to drag while preview pane opened.

[admin]

Strange.

I don't have any problems here with dragging MP4 while they are being previewed.

So for now I guess I have to leave it with you to keep you preview closed when you are about to drag MP4s...