Hi, after update from 3.0.4 to 3.1.1 my sidebar widget don't get title and tags from custom field on certain posts. I've tried to replicate this but i'm able to know where is the problem. This happen only on certain posts. I've tried to disable/enable plugin and re-install it from ftp with no success.
Now i've downgraded to 3.0.4 to solved this, but i think there is a bug in latest release. Let me know how i can help you.