v15.0.2.: template page ("Musterseite") corrupt?
Hi,
using v15.0.2 (latest version), windows 10.
Working on a document with about 100 pages, twosided, several template pages ("Musterseiten").
Suddenly one of these pages ("B-Zwischenseite") is corrupt. I can't see the page itself and therefore no of my elements.
Screenshot bottem half: a previous version of my document and the correct template page (with large orange boxes .
How can I repair my document?

And in general: very unstable this version of ID! 😞
thanks
mycc