WP 2.0.5 Adding Slashes to Custom Fields

I’ve been using a plugin called Custom Field GUI for quite a while without any problems. But since I upgraded to WP 2.0.5, I get extra slashes in the custom fields.

For example, if I have a text field and enter “Michael’s Post” in the text field, when I save the post, the field becomes “Michael\’s Post.”

Does anyone know how I can fix this?