Keynote 6.0 shows will not play videos, only sound from clips

I have upgrader to Mavericks and KN 6.0
Now when I try to play previous KN presnetations containing video clips, some play fine, others just play with sound + no video, and other play sound + video, but with loud "ehcoes" making them unusable.
What do I need to do to corret this.
Thx
Dave

As seen here:
http://support.mozilla.com/en-US/questions/742502#answer-27163
Disabling hardware acceleration worked for me - be sure to reload the page after doing so, Flash won't adjust for the change on the fly.

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