I am using 0.9.840, and I seem to be running into all kinds of exceptions and problems.  I tried the mail plugin and got it working, but the registrations do not survive a restart for some reason.  Anyone know of a wiki that has

1. Email notification
2. Locking and timeout of editing(I miss the counter in MoinMoin that says 10 minutes left, 9 minutes, etc).  XWiki does not seem to timeout

3. pdf capability
4. roadmap to have WYSIWYG

and all the normal versioning, diffing, etc.

thanks,
dean