I got it again yesterday, I was using Chrome. I cleared my cache and was okay again.
The different experiences, failures and successes, in various browsers is intriguing. I wonder what their preferred browser is (I don't see it on their website - sent some feedback).
I use several different computer -- windows and a macbook. My browser of choice is chrome, but I also use safari and ie. If I have 2 sessions open on the same computer I use 2 different browsers (you need to - your authentication does not cross browsers). While you can't have 2 transactions in progress, you can have multiple searches, it comes in handy.
If nothing else, I suggest learning to clear your cache (it's the fastest way to get going again). If you have time, reboot, also. Even if you are rebooting you should clear your cache. Pet peeve - people throw the term 'clear you cache around loosely'. If you don't know how, as it is browser specific, google whatever browser you are using: 'how to clear cache chrome', etc. The shortcuts can be machine specific (apple command versus windows control, function keys, etc).