The OK button is grayed out when tries to remove parantheses and it's contents.
Is there another way?
[EDIT]
Found out. I had to select those files that HAD parantheses in their file name.
What about mp3tag actually telling the user what's wrong? An OK box that is disabled give me a feeling that the app I'm using has a bug. I hope in next version the user can see a text like this: "Warning - Not all selected files matched the criteria. Check again and try deselect some files" or something like this.
Regards.