No problems here, can you attach a sample file to test.
Never encountered that. But first thought is this file opening as a read only and
not allowing you to save the changes? Or do you work on a network and maybe someone else
is overwriting what you are doing?
Are there any other updates you are doing that aren't saving?
OK! Isn't it always the way things happen....
I copied the sheet (in the drawing), renamed it and it stuck.
I don't know what was causing it but this worked.
Thanks for the responses.