Menu2Panel creates invalid links on Text Separator or Menu Heading

Bingo! That did the trick. Thanks!!

Side note: any known issues with RocketTheme Gantry 4 templates?

Sort of. In some templates they have this weird menu tree that slides down from the menu icon, and in some templates they're trying to do an off-canvas slide out, but your off-canvas implementation is much, MUCH better. In fact, Menu2Panel is the best responsive menu currently available for ANY Joomla template. I hop you keep it up to date with new Joomla versions!

By the way, you should put the phrase "off-canvas" or "off canvas" navigation in your Joomla extension listing. As far as I can tell, this is the phrase people would be searching for when looking for this type of navigation feature. I had a hell of a time finding it myself.

I'm testing Menu2Panel on their Gantry "base" template, and it's exhibiting some strange behavior in the way the header and footers don't slide like the main body (it may be the choice of the module position it's published to?). The header and footer are messing up the menu2panel display.

But Gantry's own responsive menu has some issues too I'm testing. I know RocketTheme has a reputation for doing things a bit different than everyone else, so I'm reluctant to ask 3rd party developers (especially template developers that do extensions to mess with troubleshooting for Gantry.

The site I'm testing: fluentanalytics.com/ - at this point I'm mainly focused on content and nav structure, so the template itself will get more scrutiny later. Then I'll see what issues may be present when I'm ready to implement menu2panel, or use the native responsive menu. I was just curious if you've already become aware of specific Gantry template oddities that pose real issues with getting menu2panel working, I'd probably not even try it.

Again, thanks for the fix. Keep up the excellent work (5 star JED review just submitted).