(USATODAY.com) - Apple released an update of iOS 7 to fix some of the problems that have marred the company's ambitious new mobile operating system.
The update fixes an issue where iMessage failed to send for some users and a squashes a bug that prevented iMessage from activating sometimes.
It also fixes another bug that allowed some people to bypass the lock screen password, improves OS stability when using iWork apps and fixes a calibration issue with accelerometers, crucial components that measure movement.
Apple's iOS 7, launched Sept. 18, may be its most troubled mobile operating system update. The new OS has been swiftly installed on more than two-thirds of existing iOS devices. But some users, accustomed to Apple devices working seamlessly with its software, have complained about bugs and some of the design changes.
Apple's latest update to iOS 7 addresses some of the main pain-points, such as iMessage issues and problems with accelerometers.
Apple CEO Tim Cook said Tuesday that he was "thrilled" with the reception of iOS 7.
"Any bugs, we'll fix," he added, in an interview with USA TODAY technology reviewer Ed Baig.