HUGE help!

I have been bumping my head against a wall for hours trying to get a solution for next/previous links that properly pays attention to categories! I’m working on a site where a previous developer implemented (poorly) a second language by creating a category for ‘espanol’, and where posts could be in multiple categories. The base WP functions for including and excluding categories get completely confused by multiple cats, though.

But 10 minutes after I found this plugin, I was able to force next/previous links on ‘espanol’ category posts to only be in the ‘espanol’ category, and able to exclude ‘espanol’ posts from the english next/previous. And I wasn’t even touching the more complex capacities of this plugin. This stuff should be in core, but it isn’t, so THANK YOU!