John,
I posted this in the Boris FX forum but i’ll add it here as well.
This issue here may be that the parameter is not actaully getting keyframed.
For some reason the default in Avid is to add a keyframe to active groups.
If you right click the add keyframe button in the effect editor you should be able to set it to all parameters or active paramater and then add the keyframes you need. with the adjustments.
Another way around this is to use the AVX 1.5 version of the plug.
If this does not help let us know which effect and parameters you are trying to keyframe.