AI breaks on certain loads for Skirmish vanilla maps

Hi, been playing a few rounds on Four Bridges skirmish map.

Whenever i create a new hero and load up a skirmish map, prior to the retinue screen a hero item stash screen will pop up.

Whenever that happens and i click next to go into the game, the AI breaks (doesnt move and all forever) and all voicelines dont work.

The only way I've been able to pseudo fix it is to run the vanilla campaign for the new hero, but that doesnt always fix it.

any ideas?