armies changing direction randomly is usually caused by the "explore" command. i think there's also a keyboard shortcut that sets units/armies to explore mode -maybe you pressed that button by accident (i think it's the "X" key, but not really sure).

I would think the same thing. I made mention of this and it is on their list of things to fix. (That is a indicator light saying the unit is on explore mode)

There are a lot of things that need to be fixed... this is not a high priority item. Game crashing (that's a biggie), getting shadows to work the way they want (that's another biggie)... I'm not sure they have enough people on this project at the moment, given all their other projects they have going, but I'm not there to say one way or the other.

Several years and no fix.  

I agree, it's not a useful tool in this game with the depth of danger out there.

Maybe they're working on adding in waypoints so we can manually adjust the areas where exploration should occur? That would seem like a good way to get rid of it.

There. It's been said.

Let's not continue to harp about these types of bugs that are obviously in the queue or SD will start to follow these threads, and thus the communities support, less.

 I personally never have and never will use the explore button, so it would be no skin off my nose if the fix to this was to simply remove its existance.

 (However I also think that exploring with scouts is useless cause heroes can accomlish that task so much better....but that's another topic).