Just wrote a post then clicked Save to keep draft. Everything disappeared from the post. How can I retrieve the draft. Help appreciated.

I think you need to contact the forum staff via the link at the top of the page to help you with this one.

Not sure if this will work, I never have saved any draft:
But try this URL: ucp.php?i=main&mode=drafts
(or go to your profile > Overview > Manage Draft to see if the draft appears into this section)