Thread:Extension talk:Gadgets/mw.loader::execute Exception thrown by ext.gadget.mySandbox: Bad constructor arguments/reply

Forgot to include a couple of relevant facts:
 * Problem is occurring in Chrome and IE8. I have not tested other browsers.
 * I have hard-refreshed on both browsers (Ctrl+F5, Ctrl+Shift+R) with no change.
 * I have shut everything down with no change (as expected).
 * I have rebooted with no change (as expected).