Television viewers watching the men's cycling on Saturday got little information about the riders' location and timings on the 250-kilometre (155-mile) road course.
Broadcasters blamed the Olympics Broadcasting Service for the glitch with GPS signals.
IOC spokesman Mark Adams says the broadcasting service was jammed by "hundreds of thousands" of people sending texts, pictures and updates to Twitter and Facebook.
Adams acknowledges that "we should have foreseen that."
The problem appeared to be solved in time for the women's road race on Sunday.Suggest a correction