Could you pls help me?

I've just bought two new style sets from PGMusic and installed them.

However, when I click on the StylePicker, choosing all styles, they still do not appear.

Curiously, then I try to browse the BB folder in the C: drive and type the name of one style in the set, that style would appear. I double click on that style and BIAB would open it. Then when I browse the StylePicker again, this style does appear.

What is happening in this case?

My sincere thanks,