Hi Greg;
FWIW: I have never used this 3rd party product but we went through a similar situation last year when upgrading an imaging OCX. After the OCX upgrade, the control would not work. We finally found the issue with the product as the vendor added a new "of_init()" method. We found out (the hard way) if you never called this method, the control would not work leading to a crash of the PB Application.
I'm not sure it this is your issue - but, wanted to alert you to check the existing method signatures for new arguments, look for new methods that may need to be called OR methods that may need to be called in a different order.
Also, if your passing things by REF - make sure you pad out the memory space of the Ref variables before calling the OCX'sd methods.
HTH
Regards ... Chris