I have not tried this outside of our application, that is going to be my next step. I just wanted to ask the question to see if anyone had any ideas to look at before I dug any further into the issue. What I am seeing started with the latest version of Firefox (25.0.1). Basically what is happening is we have a combobox dynamically rendered on the page from the server side inside of a asp.net update panel and it renders fine until the user refreshes the page. I have attached two screenshots, one before the refresh to show the combobox rendering properly and a second screenshot to show what the combobox looks like after a refresh. The combobox functions properly it is just missing it's styles.