You'd probably be better off trying to fix these issues by addressing them directly -- for the sake of your relationships with the other parties. That said, you

You'd probably be better off trying to fix these issues by addressing them directly -- for the sake of your relationships with the other parties. That said, you won't be blackballed for leaving a floundering startup your heart is no longer in, regardless of your role. Make an earnest effort to fix all the things that are bothering you and then re-evaluate your situation.