My clients website does not display the pagelines-customize/style.css just on some computers running ie8.
I have tested it on many different systems and in ie8 and ie9 and it works great, but on my clients computer none of the CSS for the menu is displayed, and it is showing also a hidden menu (for mobile).
A screen shot of what my client sees is here...
Hmm seems to be a problem with your image uploader, i have reduce my file size to 1.3 k and I still get this message ...PAUL-ie8.jpg
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