It happens all the time and it's really frustrating. Not sure what to do about it.. Sometimes it never lets me add the content, sometimes it lets me after I reopen it and it recovers.
My copy of InDesign is up to date.
What other information would be useful to know to help solve the issue?
Or is this just something I'm going to have to live with until a new update and *hopefully* it will get fixed?
I have a workaround, you can try is this helps you too.
you can save your file as idml and then do what youre doing.
Or you could just remove tables, anchored objects etc from your Indesign file and then continue.
hopefully this helps