I know it's not a true "fix", but before you click "Post" on an epic, use Control+A (select all) and Control+C (copy) to copy your post to the clipboard.
I also use the "Preview" button to check layout, links, picture sizes, last second replies by others, etc. As a bonus, I think it refreshes your logged in status -- I haven't had the problem you describe since i started using "Preview" regularly.
Scott