Navigation glitch in 2.1 dashboard?

I have been struggling to fix the navigation at my site

I created new navigation headings in my dashboard and added them in place of the standard navigation headings. Now I want to delete one of my headings and put "browse collections" back into the navigation but the dashboard won't let me. Every time I try to make a change, regardless of what it is, I get a prompt that says:

"The navigation settings were not saved because of missing or invalid values. All changed values have been restored."

In a field below, it says:

"Navigation links that have undeleteable sublinks cannot be deleted."

I appreciate any help or advice.

This has been a thorny issue before, but it's hopefully been fixed for a little while.

Omeka 2.1.2 fixed a Navigation issue that could arise when there was a conflict between a manually-added page and one added by a plugin (often Simple Pages because those URLs are configurable).

I'd recommend you try upgrading to Omeka 2.1.4, the latest version. Basically you'll just be getting a good number of bug fixes with that upgrade.

Thank you John. I will give that a try.