.I think the problem is relateed to processor speed . Anyways I've had a problem with a jerky swing meter on county Library computers , now the computers at the county library have a pentium D processor , if go to the State college library I can get on either an Imac with firefox or a PC with a pentium celeron processor and I have no problem loading is much faster and the swing meter never screws up Of course I may be wrong . I've recently discovered that when the swing meter does go batty that if you just don't swing and let it swing by itself then it will miss the ball and you get the shot over with no loss of stroke .