This sometimes happen to me as well. In fact it happened yesterday. What I do is reboot the computer with updates and then it works for me. I am not sure if this is the same issue with yourself but you can give that a try.
Thanks for the info....I reboot my machine everynight and this has just started within the last week.
I have never experienced this before.
I just noticed that within the "Title Block" the automatic entries between sheets,
(page numbers, scale, company name, names and dates, material and finish) all start off with "ERROR!:"
Open the drawing templates and re-link the annotations. Resave and try again.
If that doesn't work, try removing the annotations, resave, close and re-open the template, and then re-add the annotations.
If that doesn't work, try re-creating the templates from scratch.