Hello,
I have exactly the same problem, I cannot get Coyote Forte back...
Ther default synth is now STank 3 and every time I want to use it BiaB simply "disapears" (closes). I have checked and the program (Coyote Forte) is on my computer with its dll, and I have placed it in the Steinberg plug ins, but everytime I want to load it as the default synth in BiaB, it is rejected as "non compatible" VSTi
Bernard