Yes I did
I've tried turning off all my other plugins too to see if it was a conflict causing this issue.
I tried to reproduce the issue, but still, I can't. When I put the plugin in a new project and don't change any parameters, the button appears. Open the console (via F8 or F12, switch to console-tab) and check it for errors. You probably set a parameter to an uncorrect value. That can cause an error and the plugin doesn't work at all.