**BUG** Concise problem statement: My file where the autorouter has been run has each routed trace twice Steps to reproduce bug: 1. Create a PCB by autorouting 2. Run autorouter again with "rip up traces" NOT CHECKED 3. Results: Each trace will exist twice. This can only be seen by deleting an existing trace and noticing that it appears to still be there (a second copy). Also, by moving a trace endpoint at an angle, the other trace can be seen. Note that the only problem with this is that an extra trace (maybe more?) shows up when modifying an autorouted board. Expected results: No excess traces Browser: Firefox 41.0.2 This can be seen in my project 'Demonstrate Bugs' which I have shared with support. This is not a critical problem, but when modifying an autorouted board, it slows things down. I have not created a simple project to replicate this, but the doubled traces are visible in the board in the project, except for the wider traces which I manually redid. It appears that the autorouter was upgraded today. I did not notice this bug before the upgrade, but I didn't do much post-autoroutde board editing before, so I don't know if this is a new bug.