Source: CNET Apple Computer has released an upgrade to the Tiger operating system that fixes some bugs and offers some modest performance enhancements. Apple said in an e-mail message on Monday that the updates to Tiger (the new version is called 10.4.6) fix problems with printing to wireless printers, quotations in the Mail application, and exporting image data in Aperture. The update is available for both Intel and PowerPC-based Macintoshes.