SketchUp 2013 changed over to a non-standard tooltip technology. No wonder if problems occur with such non-standard bricolage.
Work-around 1 → disable toolbar tooltips in the Customize Toolbars dialog
Work-around 2 → install SketchUp 8
The script error is a general error that appears more or less arbitrarily or randomly in Internet Explorer (on Windows as well). These script errors even appear when the script on the webpage does not contain an error. We usually recommend clearing the browser cache etc. (which is easy to say as a Firefox user, but recently I also got one in Wine that does not go away). Often it's a matter of time, another Wine update and things behave a bit differently.

They should just leave the crane there 