Apple has admitted that there is a problem with "trackpad misbehaviour" on the new PowerBook G4s.
In a help document, Apple says: "If you find that the trackpad cursor on your PowerBook G4 temporarily stops tracking or behaves erratically, try the following steps to resolve the issue."
The company's first piece of advice is: "Make sure you test all parts of the trackpad surface and be sure you're using just one finger. Multiple fingers could cause erratic behaviour."
The trackpad on the new PowerBooks, introduced in January, features a new scrolling trackpad – Apple claims that users can "simply touch the trackpad with two fingers instead of one to quickly scroll or pan within the window". As Apple is dissuading users from using two fingers it suggests that there are some problems with the functionality of this feature.
Apple also suggests: "Reset the trackpad by placing your entire palm directly onto the whole trackpad for 3 to 4 seconds, and then remove your hand from the trackpad in one smooth motion."
The company claims: "In most cases, trackpad operation will return to normal. If so, this resolution should work if you ever see the issue again."
Apple adds that it is aware of this issue and is investigating.