suggestion:

DO NOT USE THE DXi of ST 2 - force/use the VSTi - a whole lot less issues.

there is an old thread from a few years ago (somewhere) on this

However, note that the HI-Q BIAB provided ST sounds call up the DXi version of ST. that much seems to work fine (there is a way, I think?, to make even the HI-Q sounds use the VSTi BUT that's for another post)

Larry