I'm also Running 2019/632/64bit Win10. This also happened to me once with a file. My opening sequence to import my WAV file was open BIAB. Click the ACW Button. Select file.
Note for the programmers: I edited and corrected the chords to the song and had to generate twice before BIAB recognized the edits. No tracks had been frozen. The file was still in it's just opened state after import from the ACW analysis.
Not a conspiracy theory or anything but I use the ACW daily and this never happened prior to the release of Xtra Styles 7.....

(I'm a fan of Dan Aykroyd in "Sneakers" 1992)
