FYI tis plugin has a conflict caused by MySQL Monitor

Thanks for letting us know. And yes, that definitely sounds like an issue in MySQl Monitor.

I’ve had a quick look at their code, but they are not hooking into the hooks PN uses, so they must be hijacking some of the Core WP functionality (ajax ? rewrites ?) to cause this kind of error.
Considering the total non-WP way of doing things in the MySQL Monitor plugin, I’ll leave further debugging up to its authors.

Cheers.

Irony of ironies – a lot of the debugging plugins have bugs including the debug bar.

@mike *grin* so true, unfortunately not every plugin is open to patches from the outside.