Shri,
Two things I have noticed over the past few weeks.
1. Mark Forums as Read button at Hong Kong Forums - GeoExpat.Com returns a Page Not Found. It does not give a 404 error, just the text.
It does mark all forums as read, but you must refresh the browser to see the result. It also leaves you looking at a blank page with no navigation, which may be disconcerting for some users.
2.Preview Thread button on Post New Thread window seems to have morphed into the Submit New Thread button. Both buttons submit, I tried. There is no way to preview your posts.
dot.zen