@User: Sometimes it will fail to remove all errors, resulting in a short, which should be reported by TritonRoute somewhere. Unless it's an error that the tools didn't notice, or a false error caused by some problem in the standard cell libraries. If it is a fairly simple short or open circuit, then netgen should have a reasonably clean "comp.out" output that would show two nets on one side compared to one net on the other. Is that what you get?