I have seen several threads regarding problems saving files. It doesn't seem that a solution has been proposed yet.
I have a wrinkle to add to the problem: I only have that problem when I add text to the doent. SUch that if I have a doent, it saves; I add text, it can't save; if I then delete all text from the doent, I can save again.
Deduction: this has something to do with a problem with text or fonts or a conflict with ATM.
But that's as far as I get.
I hope that this information gives someone enough to go on to come up with a solution. I am desperate here! (can only get so far in life with text-less doents...)