According to screen shots you provided there aren't applied any stylesheet to the RadComboBox. It looks as the issue of Internet Explorer - "31 css limits
". The IE8 and IE9 have limitation for number of loaded CSS files and if there are more files than 31 they are not loaded. There is two ways to resolve this problem:
- Add the RadStyleSheetManager to the site
- Remove all the stylesheets from the App_Themes folder, moving them somewhere else within the site and creating there one or several CSS files in which you link the removed CSS files one by one using @import declarations.
You can find more information and also the solution to solve this problem in the article Internet Explorer CSS limits
If the problem persist after applying the solution in the blog post, please do not hesitate to contacting me.
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