Hi Nick,
SCrew.unit can not display well in IE, which caused by jquery issue:
Do not create <input>-Elements without a type-attribute, due to Microsofts read/write-once-rule for the type-attribute of <input>-elements, see this [http://msdn2.microsoft.com/en-us/library/ms534700.aspx official statement] for details.
// Does NOT work in IE: $("").attr("type", "checkbox");

I found that it is easy to fix this issue by adding closing slash/tag in screw.buidler.js.
please kindly help to confirm it.
thanks,
your screw.unit fans - Seven