I tried absolutely everything to solve this issue but nothing seemed to work. I didn't have the privacy setting so I couldn't do anything there. I booted into recovery and ran all the commands and pretty much every suggestion in this thread, still nothing worked.
Let's start with my experience. On initial boot, both monitors worked great. As soon as I let the monitors go to sleep, only one would recover from sleep. I finally decided as a workaround I would just set the monitors to never sleep and I would try a few other options. First, I just physically turned off the monitors. I turned them back on and everything still worked. Great. Next I tried putting the mac itself to sleep. It went to sleep and woke fine and both monitors still worked. Next I set up a hot corner to put the monitors to sleep. That also worked. OK, strange, but whatever. Next I set my monitors to sleep at 1 minute, and that tested fine as well. I finally set it back to 3 minutes which is where I originally had it and I haven't had a problem since.
I'm not sure if my experience is similar to others. For instance, when one of my monitors didn't recover from sleep, it simply wasn't listed under displays... but after reboot it was. I've seen others say theirs was still listed, so that seems to be a difference.
TL;DR - I set my my monitor to never sleep and back and that seems to have cured my woes.
Oh, and I'm running 5.2.1 beta 2.
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