Thank you for sharing the issues you experience.
The issue when editing content in IE might be caused because IE has a limit of CSS files it can load and thus not all needed files are loaded. We have this issue logged for fixing and will provide stylesheets combining.
The script control does not need to be added in the head section of your page. When you use the java script control you have the choice where to insert the script - page header, widget location, or the at the closing body tag (you can use this control for GA code also).
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