$.browser.msie is undefined

1. $.browser is deprecated. Did you upgrade query recently?
 
$.browser: Ever since jQuery 1.4, we’ve been evangelizing that browser detection via the user agent string is a bad idea. Yet we’ve been an enabler of bad practice by continuing to offer $.browser. As of jQuery 1.9 we’ll remove it entirely and you’ll need to use the 1.9 compat plugin. If your code isn’t weaned off browser detection yet, check out Modernizr for a very thorough set of feature detections you can use instead. And of course, you’re welcome to read the tea leaves in the navigator.userAgent string directly, there’s nothing stopping you but your conscience.
 
2. From query devs:
 
This is expected behaviour. We *expect* IE to return a value of undefined against a UA test for Opera through $.browser.
 
3. Modernizr is a good library for feature detection. Nova days relaying on browser name is a bad habit.