You can try force-reloading the post topic/reply page. Hitting CTRL and F5 at the same time forces a reload of the page that bypasses the cache.
If that fails, would it be possible for you to take a screenshot of what you see? Use ALT and Print Screen/PrtSc and then paste the resulting image into Paint or a similar program.
EDIT: Seems clearing the cache fixed it for one person. I would suggest clearing all aspects of your cache (Cookies, temp files, and the like).
If you use Firefox, do the following:
-Go to "Tools"
-Select "Options"
-Click the "Privacy" tab
-Look for "Private Data"
-Click "Clear Now"
-Make sure "Cache", "Cookies" and "Authenticated Sessions" are checked. Check nothing else unless you want to delete your history or saved passwords as well.
-Click "Clear Private Data Now"
-Close your browser and restart your computer.
If you use Internet Explorer 7, do the following:
-Go to "Tools"
-Click "Internet Options"
-On the "General" tab, look for "Browsing History"
-Click "Delete" near it
-Next to "Temporary Internet Files" click "Delete files"
-Next to "Cookies" click "Delete cookies"
-Close your browser and restart your computer
If you use another browser let me know and I'll write up a procedure for it.