Adding a link erases all post content

This is not the first, the second or third time I lose hours looking for the reason behind a problem to find out it is oh yet again Ultimate Facebook.

It took me hours of testing back and forth to find out this funny plug-in is actually responsible for my posts disappearing every time I tried to add a link to a string of text in a post.

I triple checked: activating ultimate facebook is enough on my vanilla plain brand new installation of the most up-to-date wordpress.

Activating all other plug-ins but UF does not provoke this error.