Ive found the issue. You can read more about it in the comments here:
https://notesblog.com/notes/post-widgets/
(scroll down to Chris Rust comment on 14th of march)
I have a beta of 1.0.1 you can download here:
https://dl.dropbox.com/u/4338/notes-postwidgets_1.0.1-beta.zip
BACKUP BEFORE UPGRADING. The patch requires an update to the posts database. It should only affect the PostWidget type post rows in that database table. But its important to make sure you have a backup in case of emergency. ??
Will post the final 1.0.1 update to www.ads-software.com as soon as I have been able to test it a bit more.
And sorry for the late response to this.