I came across a different question where an answer mentioned DNSCrypt might cause issues with TBB (I don't have enough reputation to comment there and didn't what to hijack that question so I'm starting a new one here.)
I kind of presumed that TBB was self contained and handled all its DNS requests itself. So I presumed that it was bypassing DNSCrypt. This thread on Tor (not TorBroswer, which is what I'm concerned with) seems to suggests that might be correct.
I'm on OS X 10.8.5 and I use the DNSCrypt GUI 0.19. But I'm sure the same principles apply to all OSes and non-GUI DNScrypt.