jbracing,
Sorry to hear you had a bad day. But that stuff happens. I've been flying for 9 years and I still have bad days too. Don't beat yourself up too much over what happens. The ability to instantly recognize problems like that comes with experience and practice, and even then not everybody can diagnose stuff like that. We've all been there when we started, so nobody is thinking anything bad about you at all. Just get back out there and keep flying, before you know it you'll be the one helping new pilots with the same type of problem.

Ken