I tried everting from this tutorial: https://support.wix.com/en/article/troubleshooting-dynamic-pages-issues , I synced the Members collection (Sandbox to Live), I changes the permission to Everyone in every field - but noting works, still got this 404 message " There’s Nothing Here…" :(((
The Weird thing is that the pages worked perfectly since ever, and suddenly stops…
My site URL: Emust.co.il
I am in the same situation!!
I have posted 2 threads today.
It fails since yesterday.
Exactly! Since yesterday! You making me hope that the problem is not us, is the universe or at least in WIX’s production 
Same here. 404 errors on dynamic pages since last night.
Hey,
Can you please attach your site’s url so we could have a better look at the issue.
Thank you.
mine is:
@santimf The issue should be solved know.
Please let me know if it persist.
Thank you
mine: emust.co.il
@osnat_po Hey Osnat, it should be fixed now.
Please let me know if the issue persist.
@shaharn Yes, thank you, works now!
stemtriad dot com
@shaharn solved. Thanks a lot.