We have a site using an older version of jQuery (1.4.1) that is being used to power a slideshow plugin on our home page. Recently we noticed when using IE9 in standards mode, that the 'Back' button had to be clicked 3 or more times to actually go back one page in the browsing history.
In fact, if you press and hold the 'Back' button you actually see the URL of the page multiple times, rather than the actual page title once, as you normally would.
After spending the day researching the forums and trying different settings I discovered that if I update the jQuery core file from 1.4.1 to 1.9.1 or higher, the problem with the 'Back' button goes away. However, my jQuery slideshow breaks with higher versions of the jQuery core file (it is an older jQuery slideshow plugin).
If we put IE9 into compatibility mode, or use any other browser including IE8, IE7, Chrome or Firefox, the older jQuery file and the 'Back' button work properly.
Any ideas why IE9 appears to have trouble with older jQuery files?