First, I've had the game for awhile but have been waiting for stability to increase so I've barely gotten into this game. So forgive me if this is a silly question.
I know this is much less concern after trench warfare starts (or so I think as I haven't actually gotten that far), but it seems you can use interception to slide across rivers or into more favorable terrain which makes you the defender. The main issue I have with this is that you can intercept into an enemy territory across a river thus giving me a free way of crossing it without having to deal with the river penalty. Is this WAD?
I have noticed a perhaps related bug with this though is that I have used it successfully to cross the Danube (or that other one perhaps) into Belgrade without worrying about the defensive modifiers. This is in the Serbia scenario where it's easily repeatable. Anyway, the bug is that siege just won't begin, ever.
Now, if I cross into Belgrade normally, siege combat began for me. Well, it did once and then never did again so I might be missing some fundamental siege rule as I know I didn't own Belgrade.
That's about all I've been able to glean I still suffer from constant lockups, especially if I finish a short scen. and start again. But that's not the only time.