Im playing HOMAM 5 Tribes of the East (for some reason, I have the game here divided into individual pieces, not complete edition) on Win7. The game runs great, up until I want to load a saved game. Then the loading gets stuck and when I go to windows to check, it reports the game as not responding. Going back to it tough actually loads the game, but it is all broken - there are coordinates shown next to the cursor, graphics of all objects is off (blue aura around them), shooting units cannot shoot in battles, keyboard commands are not working....
I have tested to quit the game and load after, I have tried to start a new game and load just after it autosaves, its all the same.
Anyone knows what can this be caused by?

EDIT:
I have tested a little deeper. The loading of the game is actually ongoing, but insanely slow. When I left it for 15 minutes, it managed to load properly and there were no issues with the game. I have tested to reinstall the game to my system SSD disk where the saves are located per default, but no help. Did noone had the same issue? Its completely game-breaking not being able to load (and I do not have patience to wait 15 min every time)...