Well, this just isn't working as indicated. I have USE DXI Synth checked and I unchecked the "Route MIDI through to MIDI drivers" but that had absolutely no effect on my keyboard. It is STILL being routed through the MIDI out selected in the center dialog. If I select "No MIDI" my keyboard ceases to sound. Only if I select MS GS Wavetable in that center dialog do I hear my keyboard at all, and even then the delay is anywhere from 100 ms or so up to a full second.
BIAB is playing just fine, always has. It is just my keyboard which is giving me fits. You may say that the USE DXI Synth disables the MIDI Out, but that flat is not true! That MIDI Out IS what is providing sound for the keyboard.
I can see the VST/DXI Synth Settings dialog if I press that button. The top "synth track" is the VSC DXi. I show 16 instruments down below. Of course 1,3,9 and 12-16 are all "Piano 1" but who is counting?

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I have even "reset to factory defaults" and started completely over. Still the same. My piano is being played on the MIDI Out MS Wavetable Synth!