The Antisamy filter is blocking some elements that are entered vía CK buttons, i.e:
When inserting a movie using the "Insert/Edit Movie" button, the filter is blocking it. I attached two example images for a youtube url and an avi file that was uploaded to resources.
Click on the table button. Fill in "Caption" and/or "Summary" field/s and add the table. The filter blocks it showing an alert message that you can see in the attached image.
Click on "link" button. Add a link. The filter blocks it due to the "target" attribute included by default.
A minor note: When the blocking messages appears, you can see in all the images that it is showing <div class="error">.