Here's an odd error I'm getting with Version 1.5.rc3...
I have had a "Bug Report" form on my website for a while -- which worked well until recently:
Bug Report Form
Not sure when it started, but the link above now generates an invisible form. (Viewing the page's source reveals that the form data is sent, but hidden via a CSS style="display:none" reference at the beginning of the form's HTML).
Even weirder -- when I am editing the page, the form is visible via the page preview in WP. Hit publish/update and it vanishes! I've tried making a new page and inserting the form = same invisibility issue. I've also tried duplicating the exiting form into a new one and calling that form id = same trouble.