This feature isn't working properly - for me atleast.

on any class I play, it will display all debuffs, even ones I can't dispell.

I've clicked and tinkered with any of the options I thought might interface with it, but nothing has worked.

I have the same issue

This feature isn't working properly - for me atleast.

on any class I play, it will display all debuffs, even ones I can't dispell.

I've clicked and tinkered with any of the options I thought might interface with it, but nothing has worked.

If you go into your zperl.lua file, you can go to line 2029 and where it says...

return Curses.Magic or Curses.Curse or Curses.Poison or Curses.Disease

...simply delete the debuff types you don't want to see (eg Curses.Poison to remove poisons) and then uncheck the "only curable" box, and this will hotfix the addon into working how you want it. The downside is that you have to manually change the file each time you change characters.