Addon worked great for a few minutes, then never again after I attempted to change the Save String. Very good addon, that I would love to use again after I get it working.
EDIT: not sure how to reply to the dev. I tried the save string from their current response and had the same issue. Unfortunately still unusable for me.
EDIT2: Reinstalling the addon let it work until I attempted changing the save string again. It appears it only works when it hasn't been changed. Unfortunately, that still makes this unusable for me.