Apple is apparently investigating some reports of a bug that appears when some users are attempting to update their Mac to the OS X Lion 10.7.3 software update that was released last night (via 9to5Mac). Some users who upgraded found a weird bug that manifested in problems launching applications, as well as error messages with the repeated text ‘CUI’ stamped across them.
Apple is apparently aware of the issue which is, by now, occupying a significant amount of space on their discussion and support forums. The company has apparently sent an e-mail to a group of users who upgraded to 10.7.3 and experienced the issue. The e-mail requested the user group to send details of the crash report, and include system and install logs as well as a full system report.
The update to 10.7.3 is available in two versions, a ‘Client’ update and a ‘Client Combo’ update. Our recommendation is that, if you are upgrading manually, you use the Client Combo update as the Client update is a delta update that may not include all the install files that are required for your system. The Combo update includes all of the install updates that have been issued since 10.7.2 and therefore gives a greater chance of a clean install.
Additionally, if doing a manual install, your system will likely notify you if the ‘Client’ only update is able to be installed on your system so the problem may be circumvented in the first instance. If you do have any problems with the 10.7.3 installation by using Software Update, then you may be able to cure them simply by doing a manual update and install of the Combo Update. You can find it here.