Not sure if this has been addressed, but when using Firefox 7.0.1, the Post Options box pops up at the far right of the screen.
<img src="http://www.leemanism.com/milktea/postoptions.jpg" border="0" />
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Same on Chrome and IE.
edit - on those two it's not that much as on Firefox
<img src="http://dl.dropbox.com/u/10457408/Construct/ENG_FORUM/WebsiteIssues/postoptions2.jpg" border="0" />
Works correctly on android browser, btw