If you see this kind of craziness when you click the Sync Button in Sharepoint on your Office 365….
It is likely that you upgraded from Wave 14 to Wave 15 (as far as I can tell). What has happened is that your Sharepoint CSS has got screwed up. The fix is actually quite an easy one!
Go into site settings, Look and Feel, and change the theme to something else. Save it, check it, and you should now have everything back to as it should be….
There is no support article for this right now… but I guess “Crazy icons on your Sharepoint” isn’t a title Microsoft would want on support.microsoft.com 🙂