I just test Bib 8. I have a large number of references with many groups. So I need a strong tagging support.
The category in Bib 8 has a following rename problem.
When you rename a category in right pane or in the middle pane, the related references do not change the category. They are still tagged with original category.
The problem can be easily reproduced in the sample database with bib 8.
In most cases, the references do not change category.
My system is Vista.