Signature error saying read only

I am receiving an error message when I try to add a digital signature to a document right after creating it.The message says that it is read only document and cannot be saved, however it is not open in any other screens. This used to work and I have tried removing from the computer and re-installing it, but no luck. I am able to open it before emailing and sign it before sending it out, but else I get the message??? I really need this feture back and am not sure what else to try.