I've noticed this bug several times now, it has been around for quite some time and never seems to have gotten fixed, so I thought I'd report this now.

The bug I am talking about here concerns the statistic graphs. It typically occurs in rather epic games (usually somewhere between 20 and 25 years into the game, I can't recall when it happened more accurate than that). Also, it always appears right after loading a game.

What happens then is the following: After loading, all existing statistic graphs are compressed along the time axis to half their original length. To the right of these compressed graphs, the game puts a base line (showing zero in whatever the graph is for) of equal length. And to the right of that, the game charts the new graph from after the reload. After this bug is activated once, it compresses the graphs by factor 2 in the manner I described each time I reload the game again. What is left of the graphs at this point is a long base line interrupted by small peaks at 1/2, 1/4, 1/8 and so on of the graph length. Needless to say, this quickly makes the relevant parts so compressed they become basically useless.

It is of course not a game-destroying bug, but I find it rather annoying since I like to consult the stat graphs to see how a war between AI's is actually going (change in military graph is a good indicator there) and the graphs are nice ways to observe the long-term trends in a game. Once the bug appears, all that pretty much flies out the window.