The bass in question is ~ 10 years old now. When I restrung it a week or two ago I noticed that I saw plastic protruding out from the notches in the direction of the bridge. Not a lot, but enough that it potentially could change the string height. The nut looked otherwise functional so I didn't pay it any mind. Now that the bass has had time to settle for several days it seems as though the open string are giving me a sitar type fretting out sound, but it chords mostly fine elsewhere up the neck. I'm not a neck expert by any means, but it didn't look overly bowed or backbowed, so I'm not sure if this could be part of the problem as well. So is it time to change the nut, or do I have a worse (or different problem).