Hi,
thanks! From what I can see, the reason for this might be with Dropbox, where you have stored the Excel files that are to be auto-imported.
For example, when I try accessing the the file for the import of table 1 in the browser, I only get an error message from Dropbox. This basically means that the server can not load the file and that breaks the import.
The issue with Dropbox might be connected to a security issue that they found on the their systems, due to which all shared documents had to be revoked: https://blog.dropbox.com/2014/05/web-vulnerability-affecting-shared-links/
So, to fix this, it might be necessary that you obtain new shared links for your Excel files from Dropbox.
Regards,
Tobias