Thanks.
1) your Friedrich BC-6805.CivBeyondSwordSave I could continue two turns (not yet made more), so I can continue the game, probably.
2) I tested again my first save = Friedrich v. Chr.-6821 and CTD again, made recalculation first, just after it switches the research to Locks (10)
(comes no popup or message for end of research, can't remember if there should come one)
3) my game settings:
3.1 General options
3.2 Grafic options (Grafic as single unit, high details, low film quality, no films, no zoom
3.3 Audio - all set OFF
3.4 top screen line ingame before click next turn (Spezialization 1)
3.5 BUG options common
3.6 BUG Options C2C
3.7 top screen line ingame after click next turn and end of research Spezialization and starting research Locks, there comes no message or such, just 1 second before the CTD.
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