After upgrading to Lion, I am unable to read burned DVDs. Any idea what is wrong?

While I was using Snow Leopard, everything was working fine; but after upgrading to Lion, my Mac Mini (2010) is unable to read any disks that have been burned. All store purchased disks work fine, but nothing I have tried has worked for the burned ones. Does anyone have any idea what may be wrong?

Well, I did notice a few things about the disk I used that were on that list. I'm going to try burning a new copy on a new disk that has few to no scratches, not mark on it, and keep it off max speed. I'll get back to you when it's done. That may take a while seeing as it's an ISO that I'm burning and it took a good 15 minutes at max speed.

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