I've accidentally blocked YouTube. Have gone to Adblock and unchecked all YouTube listings, but YouTube is still black?

I know it is Adblock that is the problem as that’s the name that pops up when the block button shows up on a video.

Any suggestions, please? I’ve also downloaded a program (among several other ones that I also use)to clean up files, malware, etc. So, it’s not caused by an overloaded or clogged system.
??