PS:I have been unable to find any documentation or google results that would let me pursue a few "theories" I've had:
a) Acrobat X processed the target pdf without opening it within the viewer and manually running Preflight prompts you to save the pdf. This leads me to believe that since Acrobat XI insists on importing and opening the file that instead of running the preflight and overwriting the existing file, like it did in X, that XI is failing because if some bizarre file lock. Is there any way to tell XI to load the file the same way X did, or Not load as the case maybe.
c) Is there some other way to identify and remove\hide vector images?
d) Can an Action call another Action?