There are two things you might try if you haven't already. When updating remove the drivers manualy and install them manually. Secondly use the modules from that version. You might have to build your projects up from scratch. Sadly that is what I had to do.
I moved back because the bus inserts on the 4896 mixer are broke - they only work mono.
I didnt actually update the drivers I just updated the software. Maybe I should have done that. Although I think now I will wait till 3.1c final comes out before upgrading.