I just tried upgrading to the new versions of Quicktime and iTunes through "Software Update," and at the end of each one I got the following error messages: "NSURLErrorDomain -1005" (this was the message in the "Software Update" window) and "imac cp: error processing extended attributes: operation not permitted" (this was on the System log). Before this I have had no trouble upgrading new releases from Apple (like the Java update). The only thing I have done recently that may be causing a problem is that I downloaded OnyX system maintainence software and used it to run the daily, weekly, and monthly Apple maintainence scripts (the ones that are supposed to run early in the morning). Could that be causing the problem? Does anyone know why all of a sudden I would start having problems downloading Apple software updates? Any help would be greatly appreciated. I have OSX 4.8.