It's easy to armchair quarterback… especially if you're not hampered by actually reading the very brief bit of content you're speculating about.
Software is deterministic. If you can't explain why it's doing something, then it's not leprechauns fiddling with your bits - it's something that you just don't understand yet, and will have to dig a bit to find it. I'm not speaking from armchair quarterbacking here - I'm speaking from experience.
I am exceptionally dubious that you were encountering problems that were just not solvable, let alone explainable. Doing the handwavey "nobody can explain it" has a particuarly bad odor to it.
If you want to do a full writeup on the problems you encountered and what you tried to do to solve them and why you eventually gave up on them, I will be first in line to read it.
We did have 3-4 of the Rails Core team members investigating our Rails 3.x problems and none of them could figure out what it was. The problems were so terrible it made it impossible to develop with Rails 3.x any more. Obviously Rails Core members were both A) friends, and B) highly motivated for us to keep using Rails 3.x.
The problem with trusting your abilities is that you can't imagine a scenario where they will let you down. And yet, many such scenarios exist.
