I was going to hold off a few days before noting here... I've been having issues off and on with the forum post / post edit screen myself.
While the emoticons issue was fixed, what has been happening is two different things.
1. If I am using the quote/multiquote buttons, the screen comes up with the quotes, but if make entries then hit the post reply, it replies, but removes my own entries and just has the original quoted material.
2. If I am just clicking the reply or new reply buttons, sometimes the post screen appears, but everything is greyed out. I have to hit refresh, and sometimes force it to be in view source mode, for it to work.
The only time I'm not having an issue, is only sometimes when I am not using the multiquote, or using the quick reply (have yet to have a post be trashed on the new quick reply).
I am on Windows 7 sp1, and IE, both with all updates.
On a different note, is it possible as a user option, to always have the post screen come up in the view source mode... I prefer seeing the tags and raw code when making posts.