We highly recommend you stay up to date for the latest security fixes.
This looks more like a cacheing issue though. You can try running a rebuild and restart, that should reset the cache buster.
We're on top of it First 24 hours post-migration can be pretty stressful but it's starting to look good now, and will only improve over the next few days
They got you guys involved? Awesome.
I love this platform and would hate to see it get a bad name from a large scale implementation gone wrong.