One of my sites uses the TinyMCE editor, and another site does not. Having been away from C5 for a bit, I can't figure out where/how to make the TinyMCE editor the default Rich Text Editor. I've looked in Google, SO and found nothing. Help would be appreciated! :D
I presume you're using a HTML-Block not a Content-Block.
As you may see in the docs there are different type of blocks.
The HTML-Block is as its name suggests, for pure HTML and JavaScript. The Content-Block is attached to the Redactor Rich text editor.