I'm either going crazy or there is a bug in WP3.1 that is causing iframe code blocks to disappear from the visual editor window when I click on Update.
My page has an iframe (youtube video) with additional text on the page. I placed the iframe code onto the page using the HTML editor. Later on in the day I needed to change some text on that page and used the visual editor to make the text changes but when I click Update, the iframe code disappeared.
This has happened consistently since I first discovered this issue.
Bug? Something I'm doing wrong?