I unticked ALL my trusted credentials, now my You Tube app wont work.

[AC Question]

A few months ago, I untcked a lot of trusted credentials on my Samsung Galaxy S5, there were so many, and most did not say what they were for. Today, I unticked the rest, and now my You Tube app tells me to "check my network connection". My connection is fine, my browser on the phone works with no problem. Did un ticking these boxes create this problem with the You Tube app? What can I do to fix it? I have already tried restarting the phone.