Problem with MessageBox and chargen menu interaction order
One of mods, which I tried, had customized character creation process. They used message box with a tip to a player and ok button together with a stat review menu.
In vanilla MW message box is appearing over menu, and is active (you need to press ok button on message box, before you can interact with underlying menu - see hover info about stats, change name, race, etc...).
In openmw, message box is appearing over menu as well, but is inactive, while undelying menu is active, so you have to interact and close menu before you can close message box with a tip.