MichelFortin: OK, I’ve been playing around a bit more, and decided to install your Markdown 1.0.1c version (I had the 1.0.1 Extra version before). I enabled it, and everything now works fine, with the contents being rendered and formatted properly. The weird thing was that I had 1.0.1 extra running before with no problems at all, even after the update to WordPress 2.0.2. It just suddenly went haywire, without me having fiddled with or changed anything in the intervening time, which made me doubt that your Markdown plugin was really to blame. However, turning plugins off and on in succession revealed that with every other plugin de-activated, turning Markdown on caused the problem and turning it off stopped.
Since it’s now ‘fixed’ on my site, I can’t easily provide the HTML, but I can tell you that the entire page was rendered properly except for the body of the post itself and the body of the comments. So the header, sidebar, title of the post and metadata all rendered properly, but there was just no content inserted at all (it was blank in the source too, with just the div tags that normally wrap the content itself present).
I have the following plugins active:
Amazon media manager 1.5
Get Recent Comments 1.2
Spam Karma 2.2 r2
PHP 5.1.2 (cli) (built: Apr 20 2006 07:18:35)
I’m really glad that it’s working again, because I really missed your plugin! I hope that this information helps, though it’s a really weird problem.