Following on from Noel's valuable advice, in your x:\bb\data\ folder will be a file named Stylez1.bin (see image).

Can you check for that file and see if the Date/Time stamp has updated to the last time you performed a rebuild?

Also, right-click, select properties, and ensure that the file is NOT marked read only.

Also, in BiaB select Help > Utilities > Display Log File txt...

Check the top of that file for any error messages relating to the Styles (look for the date/time stamp to match the time of your actions).

Let us know the results.

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