The problem is with Adobe. My hate for Adobe Reader grows with each release. All the extra features are nice but at some point it is just too bulky for normal use. Same reason I stopped using norton antivirus long time ago. They protect you but at the same time limit your pc performance by like 50%. Anyways.....
In Adobe Reader, go to Edit>Preferences>General and UNCHECK "Enable Proteced Mode startup". Click OK. Close Adobe Reader. Next time you have it opened it shouldn't interfere with ObjectDock.
-snpiee
p.s. The adobe reader version I have is 10.1.7