Tried to import bad pages to the new document. No luck. Imported pages don’t preview.
Tried to import objects from the bad page. No luck. Stopped previewing the moment I added objects.
There is a new error alert:
when I tried to preview the page the second time.
The tip in the alert doesn’t work obviously.
The alert pops, if I deleted a component and didn’t save it before preview.
When saved or the change to ordinary object - no alert, but still empty preview.