We upgraded from 201601 to 201605 and started getting 
CANNOT_USE_AD_SUBCLASS_FOR_OPERATOR error when pausing Ads.
The documentation says this happens when we try to modify anything in the Ad other than its status:
However, we're attempting to modify only the status.
Our code worked for years with previous API versions.
We're using the Java lib.
Any ideas what is going on?
Oliver