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ok it is probably out of my league of even logicly trying to understand, so i would not bother you with questions as you probably have better things to do.
thanks

No worries. To explain it simply: there was a bug that froze the blockchain, because it didn't know what to do. On the one hand, it should allow a specific transaction but on the other hand it shouldn't allow a transaction (because of HF19 & HF20 have different rules for that).

thanks. but should not there be something that says, well the old rules worked till now, and most of the servers are still on old rules so lets find someone with HF19 and do like that? or am i just over simplicating it :D