Mac can't read Mac burned DVD but a PC can. Why?

Need a bit of help, I have an archive DVD that was burned a couple of months ago. After the burn I checked to make sure all files were readable. ejected it and popped it back in and had no problems.
This morning popped it in and it wont mount. This was a working DVD a couple months ago. It has no scratches or finger prints.
It will not mount on any macs.
MacBook Pro
Mac Pro
G4
G5
imac and so on
here is the kicker, it WILL mount on a PC.
any thoughts or suggestions?

Had the same trouble a few weeks ago. Try repairing Permissions on your System drive with Disk Utility and restarting. That solved the problem for me.

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