Hi bernyforce,
Before adding a bad 1x review please try to ask some support, you have not even opened some support topic. That’s not kind of you.
This is not a UPM problem, please read my next comment.
Also read this topic
http://wordpress.org/support/topic/wordpress-auction-plugin-2?replies=5
This is not a UPM problem, this is a WP core problem. Please read this topic and do the same what they did. Also please remove your bad review, the UPM does not deserve it.
Ok, I made some small change to avoid this WordPress core issue. Please delete UPM files from your plugin directory and download it again.