Greetings!
I have recently got a spanking new PC, and just to celebrate splashed on TW Eras too. Unfortunately, I'd gotten rid of all my previous copies of TW when I gave my old PC away, so I can't install older versions for comparison.
Game installed quickly and without fuss, I decided to test my new toy and maxed the display options and set units to huge. It worked a treat.
About third, or fourth battle into Brutii campaign I have noticed that the game speeds up during battle. It looks almost like MTW with a speed slider moved to max speed. Units move so fast, they're beyond control, their banners jumping up and down like mad, 10 times a second. This also applies to camera movement, a gentle nudge spins the camera almost full circle. Unfortunately, the above is true for ANY resolution and any unit size. It happens to any faction I play. The symptoms continue when the game is paused or at any battle speed setting for that matter. And it only affect some battles, not all of them, so I can happily win a battle with 5000 troops in it, and get totally tripped up during a tiny battle, amount of detail, amount of troops, terrain, weather - none of this seems to have any impact. The problem occurs at random. I have tried disabling antivirus, LAN, anything. I have re-installed the game a couple of times, and I'm slowly going insane. If you guys have any idea what's going on, please, give us a shout. Cheers.