Yeah, the 500lbs was the change from 1.1 to 1.11 (the last version before 2.0). Some guys were smart and started flying with a 500lb bomb before the change.
The amazing thing was that they never changed the ufo P-38L until much later. Somewhere in the 2.x's the masses switched to the Spit9. In 1.x, the P-38L rolled like a 190, turned like a Spitfire5, and had a top speed on the deck comparable to the P-47D--and people defended it, said it was based on real data, etc. blah, blah, blah. Funny how the same programmer has given us a P-38L in AH that is much, much different. Really, some of you wouldn't believe me if I told you that HT's old 38L used to be the newbie plane of choice: the ultimate furballer.