Acrobat Pro Compare feature not working.

[candympa]

Hello all,

I am running the desktop version of Acrobat Pro XI and when i perform a Compare on two documents (even two that are no where near alike (completely different text and different number of pages) the process comes back and says the two are identical and there are no differences. 

I completely uninstalled / downloaded Pro / Reinstalled and am experiencing the same issue.   I have tried this process with multiple PDF documents and always the same except a few times the process says there are changes and shows the only differences to be colored squares in the upper left corned of each page.

Any light you can shed on this would be great.  here is an example of the results of two obviously very different PDF files....