Okay been playing IC over DH and just testing out all the bonuses that are suppose to show up on units after researching them. Biggest issue I am finding is with Air Force, if you build say a lvl 3 fighter and then you research to lvl 4, after you upgrade to the new version the bonuses of range (especially), speed and all other increased values that are suppose to show up, DONT! I asked this earlier in this post and I see no one has answered my question, which makes me believe its a bug and everyone knows about it or no one really cares? Either way if someone could be so helpful and let me know how long I am suppose to wait in terms of game months to get all my research bonuses to take affect would be greatly appreciated. My previous example of Naval bombers still hold true, been almost 9 months now since upgrade from lvl 1 to lvl 2 naval bomber and my range should be at 940 per the production window if I build it. Have 6 Naval bombers sitting in Wilhelmshaven all upgraded from lvl 1 to lvl 2 and my range is still sitting at 800. This is becoming very very frustrating in terms of why bother to play if an upgrade is going to take years to complete and you research faster then upgrades are implemented. Hope to see this fixed soon.