That is a head scratcher. Given that both circuits run through the ignition switch it might be worth checking to see if it’s working properly. I often use the high tech test of juggling the key to see if things start working again. You might also find this info helpful.
http://www.ericthecarguy.com/faq/solving-automotive-no-start-problems
http://www.ericthecarguy.com/faq/solving-automotive-electrical-problems
Good hunting.