Unable to save drafts

I’m experiencing a problem akin to that of this thread, and was wondering if the WordPress developers are aware of this.

Despite not touching any setting recently, I found out a couple of days ago that I had lost the ability to save existing posts. While I can make a new post from the Write -> Post dialog, any attempt at editing the post usually ends in Firefox saying “The connection to the server was reset while the page was loading.” Auto-save seems to be gimped so badly that it hangs during the process, leaving me with a “Saving Draft…” notification next to the Save And Continue Editing button.

Everything else in my blog is working fine, so I’m at my wits end as to what’s causing this. Using the .htaccess solution didn’t quite work either, as I’d make a .htaccess file with aforementioned text inserted, upload it to my FTP, and promptly watch it disappear.