some questions

first and foremost: Loyalty. will generals with low loyalty rebel against me if they have a large army? or do they need a city somewhere to riot and cause the roman rebels to appear. also is it possible for a faction leader to ever rebel? how about the heir? and finally how low does their loyalty need to be for them to go rogue?

the bug-fixer sticky: will installing this "patch" work its fixes on saved games?

In the only BI Roman campaign I've played I rarely saw family members go rebel. Usually it was ungoverned cities that did. But then again, I never allowed low-loyalty generals to control big armies and actually went out of my way to send those troublesome christians on death-marches through Sassanid deserts to kill them off.

Faction leaders can rebel.