my first recommendation would be to take this opportunity to test your backup. there’s three good reasons:
you seem to be in a time-pinch. using a backup is almost guaranteed to be faster than than getting help from support folks – at least as long as your backup is in good shape.
it is always a good time to test your backup.
this method will likely tell you a lot more about the problem than a support person will. let me explain that one…
if you go through a support person to solve this issue then they will give you whatever solution gets you back to work the fastest. sometimes that’s good – but often it will not help you understand the problem – which is key to avoiding it in the future.
the real reason that this problem is intractable without a backup or a stacks expert is that many things changed at once – we don’t know what broke – we don’t even know if it’s one thing or many that are broken. if we knew what killed things, then it would be much more manageable.
my recommendation would be to jump back a few days with Time Machine then do the upgrades a bit at a time: start with the big stuff, upgrade RW. then Stacks. then maybe a few stacks at a time.
what’s great about this problem is that you have a really clear test: open preview, if it works move on with more updates, if it doesn’t you know the culprit (one of them at least) was in the final few things you changed. then you can selectively pull that one file from time machine and get back to work.
that said, if you don’t want to go this route, or if you backup isn’t cooperative, or if you just want to see if i can figure this one out please send it to me: http://yourhead.com/support/
this is definitely going to be a tough one for me to figure out. it could be just about anything you have installed, perhaps even catalyzed only by something on your machine, top that off with a pinch of it-happens-sometimes-but-not-othertimes and… yeah… wow, it’s a real doozy.
but go on, i bet i can figure it out.
due to the challenging nature of the problem, i’ll definitely need the whole deal, here’s how to share everything with our support line: https://yourhead.zendesk.com/hc/en-us/articles/360033849994-Sharing-Your-Project-and-Add-ons
P.S.: i have the flu at the moment. <cough cough> i’m kind of working half days right now. if i don’t respond immediately i’ve probably crawled back to to bed to
die get better. but i think i’m on the mend and the support queue is not that bad, so fire away.