After some head scratching, I figured out that this is another update that breaks the pre-update Excel's EXD file. You need to delete those.
To fix this problem, follow the steps outlined in the Wiki page here: Delete EXD files
Once I deleted all the .exd files on my PC, I was able to save TOS+ without further issues...
![2 thumbs up :thumb1:](./images/smilies/thumb1.gif)
admin