Notably, the debug version did not display the flashing error when I opened the tag editor on the laptop immediately after playing and rating tracks on the laptop. This had not been the case before.
4/13/2020 6:40:23 PM - tag editor check date cached=1/20/2018 6:47:43 AM,636520276639497386,file=1/20/2018 6:47:43 AM,636520276639497386
4/13/2020 6:48:32 PM - save rating: \\DESKTOP\Music\Organized\The Thermals\(2016) We Disappear\04 - If We Don't Die Today.mp3
4/13/2020 6:48:32 PM - url=\\DESKTOP\Music\Organized\The Thermals\(2016) We Disappear\04 - If We Don't Die Today.mp3,before=1/20/2018 6:47:43 AM,after=1/20/2018 6:47:43 AM
4/13/2020 6:48:32 PM - save rating: \\DESKTOP\Music\Organized\Alejandro Escovedo\(2016) Burn Something Beautiful\08 - Beauty of Your Smile.mp3
4/13/2020 6:48:32 PM - url=\\DESKTOP\Music\Organized\Alejandro Escovedo\(2016) Burn Something Beautiful\08 - Beauty of Your Smile.mp3,before=4/24/2019 3:14:30 AM,after=4/24/2019 3:14:30 AM
4/13/2020 6:48:42 PM - tag editor check date cached=4/24/2019 3:14:30 AM,636916724702656175,file=4/24/2019 3:14:30 AM,636916724702656175
But then I put the debug version on the desktop computer, opened the tag editor for the tracks I had played and rated before on the laptop, and they both showed the flashing error.
4/13/2020 6:53:31 PM - tag editor check date cached=4/24/2019 3:14:30 AM,636916724702656175,file=4/13/2020 10:48:34 PM,637224149145665531
4/13/2020 6:53:34 PM - tag editor check date cached=1/20/2018 6:47:43 AM,636520276639497386,file=4/13/2020 10:48:34 PM,637224149145089556
Then I closed MB on the desktop, went back to the laptop and opened it, and checked the tracks over there. Now they are showing the error on that machine, too.
4/13/2020 6:57:03 PM - tag editor check date cached=1/20/2018 6:47:43 AM,636520276639497386,file=4/13/2020 10:48:34 PM,637224149145089556
4/13/2020 6:57:07 PM - tag editor check date cached=4/24/2019 3:14:30 AM,636916724702656175,file=4/13/2020 10:48:34 PM,637224149145665531