[Raapys]

The visibility bug is basically symptoms of the malfunctioning stock ECM/ECCM systems in MoO3. Ships will, apparantly without reason, change between being visible and invisible, even if they're inside sensor range.

The Finance Wraparound bug is a problem where very large empires who's income in a single turn exceeds a certain amount suddenly goes bankrupt, ending the game.

The stuck techs bug is quite literally what the name indicates; there's a chance technologies you try to research will stay in the "Research Items" box indefinitely, never finishing.