Security Certificate Errors
 

This last week, when I visit Youtube or GTAForums, I get a pop up under the address bar that says IE has blocked content because of security certificate errors.

This only happens on Youtube and GTAForums, both of which I've visited hundreds of times before with no problems.
I've not visited any new websites in the past week or installed/ran any new programs.

Any idea what it is and how I can fix it?

Switch to Chrome

Some certificate company has been dropped for being shit. Switch to Firefox or Chrome as they seem to be handling it better.

Keep getting this on my phone on Twitter & FB