See there has been no comments on this for a week - I do need help. I have looked a little more closely at what is happening, and the problem occurs every time I close a file that has annotations in it, whether the file or annotations have been edited or not. Currently I have 19 'Error saving annotation information to...' dialogs that need to be closed every time. The only way I have found (so far) to resolve this is to delete all annotations!