If you go to:
http://docs.jquery.com/Plugins/autocomplete
and try the example in IE 9, it does not work. Every other browser it does work. I have searched around the internet for a quick fix but can’t seem to find one. It seems to be making the ajax request for the autocomplete, but NOT displaying the box.
You’re not going to find an IE 9 fix for this. You should read the author’s page for your plugin. It’s been deprecated and the last version of Explorer it’s been tested with is 7.
http://bassistance.de/jquery-plugins/jquery-plugin-autocomplete
“Note (2010-06-23): This plugin is deprecated and not developed anymore. Its successor is part of jQuery UI, and this migration guide explains how to get from this plugin to the new one. This page will remain as it is for reference, but won’t be updated anymore.
If you’re still using the plugin and can’t upgrade to jQuery UI autocomplete: Someone else is maintaining a GitHub repository with the plugin, including some fixes.
There’s also an update to the original version of the standalone plugin in a Google Code project.”