I've installed a custom msi on the Tridion 2011 CMS which updates many Tridion configs and do not have an insight of what configuration got changed. Now all css' are interpreted as text/html instead of text/css and CMS isnt loading correctly. The error in Chrome is : Resource interpreted as Stylesheet but transferred with MIME type text/html: "http://sf1-dv9-iub-cm.wellsfargo.com:12300/WebUI/Editors/CME/Views/Dashboard/Dashboard_v6.1.0.55920.15_.aspx?mode=css".
Phew - The issue seemed with the System.config file. Copied it from a properly working environment and the messed up environment is back to normal! Thanks all for checking.