There is a recent update for the DPS plugins which you should install if you have not done so already.
The bad news is that the save/save as issue is a known bug for Mac users and is under investigation. I believe the current wisdom is to save IDML when that happens so that you don't lose your work (try File > Export and change the type to IDML). You should then be able to open the .idml and continue editing, and with any luck be able to save that as .indd.
I already did the new update. And the problem is still the same.
I'm sorry to learn about this bug. When I called the hotline, nobody told me anything about this bug. When I said it was a bug, the man told me the problem was with my computer! And he didn't want to help me anymore.
I know I can export my file into .idml, but it can't be a good way to work.
Thank you again.
Nobody is suggesting it's a good way to work, but it will prevent you from losing what you've done.