Update: I called Wix and after they transferred me to 2 agents, they told me that all my work was lost and impossible to recover. Apparently my session had timed out and there’s no warning in the interface when this happens, so I had no way of knowing. When I saw the Publish button progress bar moving, I thought it was in the process of publishing, so I had no idea my work wasn’t being saved.
To make matters more frustrating, the first thing they tell you is to clear your cache, but then if that doesn’t work and it turns out to be a timeout issue like mine, they’ll tell you that there’s no way they can recover your work after your cache has been cleared.
I am really frustrated and disappointed in Wix. Are there other hidden traps I should watch out for, as an new, non-expert user?