I've had a few issues since updating our Magento site from 1.9.2.4 to 1.9.3.
When we try to save attributes in the backend, we get a "Decoding Failed: Syntax error" message in red at the top of the backend.
We tried the new SUPEE-8788 patch on a different branch, and get the same issue.
Has anyone experienced this or know a fix?
Best Answer
I had a similar problem. Just fixed it now. For us it was a third party module that had an error in their javascript. Causing it to send a bad json object. I'd check your console log and see if you had any javascript errors when trying to save the product attribute.