Button only displays on random pages

I installed Buttonizer on the dev site and it appeared to work on all pages, as desired, but when I installed and configured identically (i think) on the production site, the button only displays on random pages. (Oddly if I’m logged in, then it displays on all pages)

I’m using the free version that dosen’t have page rules.

Any ideas what could be wrong and how to fix it?

Thanks

The page I need help with: [log in to see the link]