The new glass trackpad introduced on the MacBooks unveiled by Apple last month appears to be giving some users fits.
The trackpad on the new MacBooks and MacBook Pros does away with a separate button, turning the whole trackpad into the mouse button. It also supports several new multitouch gestures for rotating pictures or scrolling. But The Register notes that some users are running into problems where the MacBook doesn't register clicks on the trackpad.
Apple's discussion boards are seeing some activity related to this issue. It's not clear whether this is any kind of hardware or software glitch, or whether or not people are actually causing the problem by resting their thumb on the trackpad over the space that previously contained a button. Older MacBooks had a settings option for ignoring accidental trackpad inputs, but that seems to have been removed on newer models to allow for the multifinger gestures.
Either way, a MacBook user reported that he e-mailed Apple CEO Steve Jobs to complain about the issue, and received a phone call from an Apple representative saying that the company was looking into the problems. We weren't able to duplicate the problem on a MacBook lying around the office, but let us know if you're seeing this issue.