Apple has admitted that a minor security update to the Mac operating system has prevented users from gaining access to certain websites or running Java-based applications.
After updating to Mac OS X 10.3.9, some Mac users have found their Safari web browser quits from Java-enabled websites, and Java programs on the machine may not launch or suddenly quit.
Apple released the update to the operating system last Friday. Apple said the problem could be fixed by re-installing two earlier security patches - Java 1.4.2 update 2 and security update 2005-002.
Apple launches its next generation operating system Tiger at the end of this month.