During development testing I noticed that Logger.js was leveraging Object.defineProperty hooks for setting some values (logging, LogLevel).
IE8 unfortunately requires that the first parameter be a DOM element and fails with:
Object doesn't support this action; Logger.js, line 73, character 5.
I have some changes to push that will use basic setters instead of the defineProperty hook. So far on the browsers I've tried (IE7-IE10, FF23, Chrome30) this seems to be workable.