Since Windows nightly r51876, the Styles, Metrics, and Properties panes of the sidebar in the elements panel do not display any information and write "Error dispatching" messages to the console. Moreover, attempting to expand these panes does nothing (i.e. you cannot expand them from their collapsed state). For example, launch the Windows nightly r51876 or greater. Visit http://www.apple.com. Then inspect some element on the page. Notice, the following error messages are written to the console: Error dispatching: searchCanceled Error dispatching: searchCanceled Error dispatching: getStyles Error dispatching: getComputedStyle Error dispatching: getInlineStyle Error dispatching: getPrototypes Error dispatching: addInspectedNode Error dispatching: getStyles Error dispatching: getComputedStyle Error dispatching: getInlineStyle Error dispatching: getPrototypes Error dispatching: addInspectedNode
I see layout tests passing on Windows bots. There are some tests checking InjectedScript calls that fail for you. Could it be deployment error? Do you extract the build into the clean folder?
Works for me.