[Plugin: Quotes Collection] -1 Error sinse 1.5.1 update

Since I update to 1.5.1 sometimes ( I say sometimes) because I couldn’t find a behaviour patron, I get “-1” string instead of the quote.

The most of the time the auto-refresh works, but when I get “-1” stops working.

I didn’t change any code but for if it’s useful for diagnosis I use this code:

<?php quotescollection_quote(‘auto_refresh=14’); ?>

Any idea will be appreciated.

Thank you

http://wordpress.org/extend/plugins/quotes-collection/