Although some here might argue, and it hasn't been an issue the last couple of years, I know this has helped me sort out some weird BIAB missing file issues over the years.

A typical BIAB installation is hundreds of thousands of files and folders and, especially if you are installing a newer versions over an older existing installation (which itself was probably written over an even older existing installation), sometimes file/folder permission errors can crop up.

This is what I have done in the past (which as I said, disclaimer: has helped me). smile

Select the folder of your BIAB installation in the Finder, right-click and do "Get Info" then...
1- click the padlock in the lower right , and enter your password.
2- click the + button in the lower left, select your name from the list, and give yourself "Read & Write" permission.
3- Click the gear icon and apply permissions to all enclosed items.

It will ask "are you sure ?" click yes, and wait a minute or two depending on how may files are in your BIAB folder.
Then I would try to rebuild the RealTrack list and see of your tracks are back.

As I say... I know there are others here who will say this is not necessary (and in theory it shouldn't be necessary).
But, I have had it happen over the years, where one individual installer will change the permissions on one folder and that's all it takes.

Hopefully this helps !

- Jay

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MacPro 5,1/12 core@3.46GHz -- OS X 10.15.7 -- ATI 7970 -- 32 Gig RAM -- Crucial 500GB OS SSD -- Samsung EVO 1TB Audio/Sample SSD -- BIAB 2024 -- Logic Pro X -- Cubase Elements 14 -- Too many plugins