We are aware of the problem where mapping arrows are not showing in the mapping editor. The app still works fine. The issue occurs only in latest Chrome 26 browser. We are working on fixing this problem. As a workaround, please use Firefox 19.0.x or 20.
I Disabled Chrome update. If its working good why update?
To Disable updates.
Enter chrome://plugins in address bar
Scroll down to Google Update and click disable.
You can always re-enable when your sure there are no bugs in chrome update.(Which there usually are...)
So much for that. Even my ver 25 chrome is affected now