Steve.
please post the following pics so people arent guessing.
1. the presonus control panel settings.
2. all biab midi and audio driver settings in the dialogs.
3. win play back and recording setting dialogs.

so people have a complete picture of ALL settings.

if there is any way you can still run the earlier bb version without a major disruption. write down all settings on the old biab version so you can compare with 2021 settings. and look for differences...

what i do BEFORE i upgrade is take pics (1,2,3 above) of all my settings just in case i run into prob s.
best
OM

my songs....mixed for good earbuds...(fyi..my vocs on all songs..)
https://soundcloud.com/alfsongs
(90 songs created useing bb/rb)
(lots of tips of mine in pg tips forum.)