[Plugin: Pretty Link Lite] PL 1.5.0 – will not create pretty links anymore

Hi,

I have Pretty Link Lite v. 1.5.0 on a WP 3.2.1 install with 1193 pretty links created.

Today, all of a sudden, it won’t create pretty links anymore. I keep getting the error:

ERROR: This Pretty Link Slug is already taken. Check to make sure it isn’t being used by another pretty link, post, page, category or tag slug. If none of these are true then check to see that this slug isn’t the name of a file in the root folder of your wordpress install.

But none of the above apply. I even check the pretty link I want to create and if I try to access it, it returns a 404. (which is normal, because I don’t have that URL anywhere, neither do I have a folder like the link I’m trying to create).

IT DOES THIS FOR ANY LINK I TRY TO CREATE.

Even if I try something like mysite.com/out/oisfjiwefpowiefj , it still says it’s taken.

IT ONLY WORKS IF I LEAVE IT TO CREATE ITS DEFAULT 3 CHARACTER SLUG

Until now, Pretty Link didn’t populate the slug input by itself. It was blank and I wrote my slug there.
Now, when I click ‘Add New Link’, the slug input field gets automatically pre-populated with a random 3 char slug.
This way it works, but I can’t have custom slugs anymore.

Ideas? Bug?

http://wordpress.org/extend/plugins/pretty-link/