HTML code such as < button onclick="window.location.href='/mypage.html" > gets the javascript onclick stripped after upgrading to the latest version. Is there a way to prevent this?

Also it looks like h2 turns into p
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I think the reason may be that the tinymce plugin isn't working for me for some reason; I don't see formatting options anymore.
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Update: tinymce wasn't the answer. I needed to enable the plugin. It still strips the javascript and changes headers to paragraphs on the site (though they remain in the description code area).
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** Update: Ugh. Disregard the Header to paragraph issue. That was indeed fixed by enabling tinymce. Only the javascript issue remains.