There shouldn’t be a pt.js file in that directory. There wasn’t in 3.3.2 nor in 3.4. There’s several possible issues that could be taking place, but my guess is that your WordPress install has been compromised and your theme files are corrupted. They are then trying to access that js file which is no longer there and it’s no longer there because it’s within the WordPress core which gets erased during an update.
Download your theme file and do a search for pt.js. Also do a search for eval(base64_decode and see if anything comes up.