InDesign won’t save files – says they’re damaged and shows “database error”

Hi everyone,

Today on two different computers, both running the latest InDesign, I started getting this error every time I edit a file:

“InDesign is unable to save this file. We tried, but it appears to be damaged.”

Then, when I try to close the file, I get another message:

“Could not complete your request because of a database error. The file ‘InDesign Defaults’ is damaged (Error code: 1).”

I’ve tried uninstalling and reinstalling InDesign, resetting preferences, testing files saved locally, in the cloud, and on a USB stick, but nothing helps. I can open and save files as long as I don’t make any changes, but once I edit anything, the error appears.

Everything worked fine yesterday, and now both computers are affected. Is anyone else seeing this problem, or does anyone know how to fix it?