Undecidability

Friday in class we discussed the idea of "undecidability" in post-structuralism, particularly referring to Requelme's article. I wanted to know what everyone thought about this. Before discussing post-structuralism, on multiple occasions people have expressed the opinion that there is not a right answer or interpretation, that there can be multiple interpretations. Do you think this is the same idea expressed in post-structuralism? Our class seemed to end on the decision that "undecidability" implies that one interpretation can't be picked over another, that the reader reaches a point at which a decision can't be made. Does everyone agree? Is it possible to see ambiguity and yet still choose one interpretation over another?