We are aware of this and have an outstanding bug ticket to investigate this further. Thank you for letting us know.
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I am having this proble with Cruelan. The aspect ratio of both the template and administrative template has suddenly changed and I have no idea what I did to make this happen. It's fine in Safari but very small in Firefox which I work to develop. Did you guys ever figure out what the problem is and create a fix? Everything I have installed is the latest. All of the plugins etc including Joomla 3.4. But this happened before the update and didn't change. I was hoping it would fix it.