I don't have a way to test the Oracle Grid Control plugin. I'll ask around and see what I can come up with.
From an iControl perspective, the only possible issue I could see is if the get_global_statistics() method in the newer version of the BIG-IP introduced a new statistics type introduced in a newer version of the SDK and the grid control plugin didn't have a proxy handler for that type, then it could cause an runtime translation error from SOAP to native types. I'll look at the sources between the two versions of your BIG-IPs and see if a new global stat type was added. If so, we'll need to get an updated version of the grid control plugin built. This is all guessing though, so it could be some other issue completely.
-Joe