Hey Michael,

I've never seen this message by myself but could you check if all solutions have been installed / deployed correctly in "farm solutions" screen in Central Administration?

Also, can you verify that there is no pending database upgrade in the Nintex database settings screen?

Do you have any custom or 3rd party actions installed?

Kind regards,

Enrico

The issue was related to a pending database upgrade as you had suggested.  Thanks - Mike

Great to see your problem could be solved.

Could you mark the thread as answered to others see it has been solved?

Kind regards

Enrico

Hello,

I have the same issue but I'm using a SharePoint 2013 environment where sites are still running in 2010 mode.

I'm not seeing any pending upgrade on the Nintex databases but I do have the "Database is up to date, but some sites are not completely upgraded" status for SharePoint content databases (due to the 2010 mode offcourse).

Is this the cause of these messages when I try to edit the permissions for actions?