I had this, as have many others. Mine started 6 days on a weekend before the easter event and ended when they put on the new patch for the easter event. Unfortunately that was never any resolution and no reason why it occured, it just ended on the patch day for me. I still get stuck sometimes with the tips overlayed over blue and a refresh sorts it out but there's no definite fix I've found.
During my six days of downtime I tried chrome, firefox, safari and internet explorer, cleared all the cache, cookies etc and tried various computers in the house and nothing fixed it, it just went away on a patch day.
There is something wrong on the server end making this happen to people but as yet no one knows what it is or why it happens, it just happens to random people. If people say I'm wrong about this then I'd love to hear an explanation of what the problem is and how it can be successfully fixed other than clear cache/cookies
