If you're having difficulties please provide:
- type of device you're using; PC, Tablet, Smartphone, ETC.
- OS Version
- Browser you are utilizing
As is the case in a number of instances when trying to debug or troubleshoot something this info is helpful to say the least.
I'm been running 'tests' for over a week now attempting to duplicate this problem, on (2) android tablets - (4) different browsers | (1) desktop PC, Win7Pro, (2) browsers | (1) laptop, Win7Pro, Firefox | (1) Laptop, Linux Mint17, Firefox. I've only had two of the browsers under android fail.
Firefox seems to be the best bet currently.
If you're on Win10 and using Edge, forgetaboutit-ditchit, switch to Firefox.
Apple OS try it also.