DVDs not recognised since updating to 10.6.8

Since updating to 10.6.8 I get the message format not recognised when inserting DVDs  movies / recordable media etc. Any ideas.

Just to clarify: DVD movie discs inserted into my iMac come up with the message "the disk you inserted was not readable by this computer." Data, software install disks and audio CD's work fine. I have tried repairing the disk and permissions, as well as creating a new user account. I applied the 10.6.8 update to my wife's macbook and no problem reading DVD movie disks. So is this problem specific to the iMac? I have a 2.66 core duo with 4GB of RAM. Any ideas anyone?

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