problem

I found a bug (pc win10x64) when draggng mastered files from 1 file group to another filegroup.
What happens, I save a wav file in file group 1 and after that, I drag it to file group2.
This works, but sometimes the file also stays in file group 1 and you can’t close it (nothing happens when you click the X), it stays there untill you close wavelab completely. I can close the file in file group 2, but stil the file stays open in file group 1 and I can’t close it.
I can close the complete file group 1 without problems and it’s in the audio files window.