When adding a Flash movie to Announcements, the first time you post you get an error :

Error showing on screen is:
Alert: The embed tag contained an attribute that we could not process. The movie attribute had a value of "http://qa1-nl.sakaiproject.org/access/content/group/ace12b5d-c141-47a9-8bdb-f94c3131a2b5/barsandtone.flv". This value could not be accepted for security reasons. We have chosen to remove the entire embed tag in order to continue processing the input.

Second time you post, it saves and Flash movie plays fine.

Happens on Windows 7 / IE 9; Mac / Firefox ; Windows 7 / Firefox; Mac / Safari ; Mac / Chrome ; Windows 7 / Chrome

Here's an example of the source HTML before saving:
<p>
<object data="/library/editor/ckextraplugins/movieplayer/StrobeMediaPlayback.swf" height="240" id="movie451866" type="application/x-shockwave-flash" width="320"><param name="movie" value="http://qa1-nl.sakaiproject.org/access/content/group/ace12b5d-c141-47a9-8bdb-f94c3131a2b5/barsandtone.flv" /><param name="FlashVars" value="src=http://qa1-nl.sakaiproject.org/access/content/group/ace12b5d-c141-47a9-8bdb-f94c3131a2b5/barsandtone.flv&amp;showplayer=always&amp;width=320&amp;height=240&amp;showiconplay=true&amp;autoplay=0" /><param name="allowFullScreen" value="true" /></object></p>

source HTML - after saving (Post Announcement)
<p>
<object data="/library/editor/ckextraplugins/movieplayer/StrobeMediaPlayback.swf" height="240" id="movie451866" type="application/x-shockwave-flash" width="320"><param name="FlashVars" value="src=http://qa1-nl.sakaiproject.org/access/content/group/ace12b5d-c141-47a9-8bdb-f94c3131a2b5/barsandtone.flv&amp;showplayer=always&amp;width=320&amp;height=240&amp;showiconplay=true&amp;autoplay=0" /><param name="allowFullScreen" value="true" /></object></p>