I have noticed the following, during certain matches, in the game mode "Annihalate no pop-cap", OP's aren't working properly. What I specifically mean, is that if I build OP's, then some of them won't give the added resource bonus, while other's will. They will cause the lockdown, they just tend to sometimes refuse to give me the extra resources.
This has happened with both the US and WM on a variety of maps (both Relic, EF, and custom maps).
I can't provide a screenshot or anything similar at the moment, I'll try to remember to make one in a later game.
Cheers