My BIAB has been behaving funky after upgrading to 2019 from 18 whenever i goto save out as an audio file via the save special menu it never remembers the previous folder i saved to and always goes straight to the Biab folder itself which is a minor but annoying thing having to navigate to the correct location each time i save.
Also a similar issue is in the style selector, that never remembers the sorting or the last used style in the list and just goes back to the top which is annoying if im working through trying out styles and it keeps going back to the start of the list.
Any ideas?

The way it's working in my testing (and the way I expect it to work) is that any File - Save As operation defaults to the last used folder for opening or saving a file. What OS do you have?

I do see the same as you with the StylePicker. Ideally it should open with the current style selected. We will look into that.