No it doesn't explain it especially since we seem to be working with the same versions - however, it was my QA tester who brought it to my attention so she is clearly having problems too.
When inserting the code, need to be careful not to "break" existing parameters such as related videos. Need to add with an ampersand - ie rel=0&wmode=transparent" which will become rel=0&wmode=transparent" (This wasn't as easy as it should have been with some odd changes in the embed code when I saved and re-opened that seemed to appear from nowhere - some sort of autocorrect built into the editor??)
Of course none of this will be necessary when we get moveable glossary popups so am still hoping that this will happen before this site I am working on goes live in a week or two!
Regards,
Bronwen