How do you know you don't have a specific problem with it on your computer? I have none of the issues about which you speak. Works beautifully. The GUI is changed a little bit, for me aesthetically for the better, but that's a matter of personal taste. The changes from 2012 are insignificant. I don't really see much more than cosmetic changes. Maybe it is a little faster, but that might just be placebo effect with an upgrade since I haven't had a chance to use it long enough to make a fair evaluation in that regard. From what I understand, the product will no longer have yearly names, and will just be upgraded as Symantec seems fit with updates, and revisions as appropriate. People will just buy Norton Internet Security and pay for their yearly subscriptions and be able to update to the latest software version as long as their subscription is in good standing. Makes sense!
The crash of Chrome due to incompatibility with Norton has been a long known problem, and it seems that Symantec and Google can't get their respective acts together in that regard. The problem is easily solveable by just removing Norton from the Extensions section of Chrome (Wrench/Tools/Extensions....either disable or delete Norton!) Works like a charm!
Some people have problems with Outlook crashing due the presence of Norton Antispam as an add-in. If that be the case, in Outlook 2010, go File/Options/Addins(left pane)'Manage Addins and uncheck the Norton box which will also eliminate it from your main Menu bar.
Thankfully, I notice that Norton Upgrade does not seem to re-add their extension either in Chrome or Outlook, if you have removed it, but maybe not at all unless you select it as such, but I can't evaluate that since I already had made the exclusion. If you have Antispam activated in IS settings, it will still function in other roles, particularly antiphishing, so it's better to deactivate Norton in the area where it causes trouble, rather than globally disabling it in IS's settings.
One thing that has been reported as a bug is that on some machines, Version 2013 loads slowly into the Sys Tray and you have to wait maybe 30 seconds before you can access it on your desktop. I have one computer where that is the case, whereas, on another, it loads normally, both with the same settings. It doesn't interfere with the computer's function in terms of slowing it down, and really isn't important unless it annoys you just by not being so spiffy loading as 2012. If you have the 2012 version, you can uninstall 2013(use the Programs/Norton/Uninstaller rather than Add/Remove programs), and reinstall your version of 2012 without any problems. You can elect to save or remove all your settings in the process. Type in the corresponding key and your subscription, which is not tied to the version, will be immediately updated as to time remaining. I've heard that Symantec is aware of the problem in 2013 and "is working on a solution"! Truthfully, this minor glitch, in itself is in NO way a deal breaker or worth the loss of a star, at least from my perspective, but I respect that it may be intensely irritating for some people as the forums are full of complaints about this!