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I was having the "invalid JSON string" issue and I tried  every solution out there with absoutely no positive effect. I had managed to set up perfectly on my netbook and was trawling through all the files trying to find some difference, I even transplanted the installation from my netbook onto my desktop and still this JSON issue popped up on my desktop.

Finally I came to the 'my.cnf' file stored in /etc/ on my Fedora linux box. I found that opening that and deleting the contents meant that my youtube search and insert started working perfectly!

You may want to try deleteing /etc/my.cnf or erasing everything in it to leave an empty my.cnf. Hope that that helps!

Best Wishes

Greggles