I'm having a problem with a block called Code Block that the developer insists is a Concrete5 issue and not a problem with his block. So I thought I'd see if anyone else has had a similar issue, which is this: when I add the block to any page, I get a message that says "can only edit on admin" (see attached screenshot).

I'm using 5.7.5.2, theme is Fundamental and I have all page permissions set to Administrator, of which I am the only one. No other block or editing process gives me that message.

Any ideas? Is it C5 or Code Block?

Thanks!