We are using SDL Trdion 2013 SP1 and when trying to edit content through XPM then CME is not rendering properly, for reference see the attached image.
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I see a similar ribbon toolbar when certain versions of IE run in compatibility mode.
Even when not set explicitly, IE may automatically display certain (all or Intranet) sites in Compatibility Mode based on the check boxes in
Compatibility View Settings.
Try turning the setting off for the specific browser as well as follow the other browser settings in the documentation.