Hi Bert,
Here's how to put Realtracks back to playing from the hard drive.
Go to
Opt | Preferences and then select the 'Realtracks' button ( #1 - 3).

Now deactivate "Use a custom folder location" (#4) and then click on "Update" (#5). Exit using OK (not Cancel) and restart BIAB.
That should do the job.
If the above doesn't bring joy, simply activate the "Custom Folder" (#4), click on the folder that will appear where #6 is and then navigate to "d:\bb\Realtracks". Now click "OK" and then "Update". Exit using OK and restart BIAB.
Regards,
Noel