After a crash I noticed that the error.log mentions common/dynasties.txt and lines 22818 and 22859 where extra { seem to be a problem:
In common/combat_tactics.txt there's "archers_defensive = .1" in line 218 which appears as a "Malformed token: .1" in my log - 19 of those and here's a fixed file version:
https://rapidshare.com/files/1599913821/combat_tactics.txt ).
And in history/characters/expandedhistory.txt, line 112 for the character "Itta, wife of Pepin of Landen. She is AKA Saint Itta" the attribute "father=" is empty.
I don't know how responsible those errors are for my crashing though - they might be logged and ignored thereafter...