Ok, so looking at the posting page, I got some js errors all related to the missing onunload_functions that should be defined in your overall_header.html and is actually missing from there (have a look at the prosilver's one since your them is based on it). It is also clear that your overall_header.html is missing the USU
Have you tried to post with js deactivated (I did not try to post yet) ?
Because it could only be js to block you here.
If not, it is very likely that the problem comes from missing code in your style files, or another implementation mistake.