I went from version 21 to version 13 of the software. I uninstalled the version 21 software, and followed the clean up process in tech note QA34332 and installed version 13. The software opens, but when I click on discover (or any other option that tries to communicate with hardware) it crashes. I know downgrading versions past version 20 of the software causes problems, but I can not seem to figure out how to get the software to stop crashing. Any tips?