I have BIAB on two computers, a desktop I use for work (and some music) and a laptop I use exclusively for music (mounted above my Yamaha Piano with the usually spaghetti cables).
I* don't use BIAB as much as I would like., The reason will be a topic for a different post.

The other day I composed a song in BIAB and listened to it while I was composing it. Worked OK.
Suddenly, the sound stopped completely. I checked my sound cards (I have near field speakers with two inputs: my laptop headphone jack and my Prosumer sound card. Both should and can play out of the speakers at the same time.

Yet, BIAB went through the motions and no sound was coming out. I changed the style, in case something went wrong there, no dice.
I loaded a different song I know has always worked fine. Again, no sound.
I even plugged headphones in my laptop and made sure to point the output to the internal sound card. Again, nothing.

At that point, I noticed BIAB was telling me to upgrade. I figured "Why not?" maybe it'll fix this issue.

I run the suggested upgrade, picked "Launch BIAB" and... I got the BIAB 2017 splash screen.
Even worse, it wanted me to enter the serial number. I went to get it, I entered it and it refused it.

I think I did have 2017 at some point, but for sure I upgraded to 2020 in.. 2020 sometimes.
On this laptop I never even installed BIAB 2017, as I purchased the laptop in 2021.

I am a bit at a loss. Of course I can get my 2020 installation files and install it again, but I was wondering if I did something wrong.
I don't want to repeat the error again.

Almost forgot: at some point I moved songs composed on my BIAB 2017 onto the 2020 folder. Maybe I moved a file I shouldn't have?

Any ideas?

Thank you.