Suddenly stops recognizing +R disks

I burn a lot of Verbatin DVD-DL and suddenly the G5 stops recognizing this media, dont recognize DVD+R or CD+R.
Any idea?
Ivan

Post a URL and the error message you receive and tell us more about your Mac.

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    10  com.apple.CoreFoundation                0x96ed3c29 __CFRunLoopRun + 1961
    11  com.apple.CoreFoundation                0x96ed301a CFRunLoopRunSpecific + 378
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    13  com.apple.HIToolbox                     0x91fbdf5a RunCurrentEventLoopInMode + 242
    14  com.apple.HIToolbox                     0x91fbdcc9 ReceiveNextEventCommon + 374
    15  com.apple.HIToolbox                     0x91fbdb44 BlockUntilNextEventMatchingListInMode + 88
    16  com.apple.AppKit                        0x9433d93a _DPSNextEvent + 724
    17  com.apple.AppKit                        0x9433d16c -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 119
    18  com.apple.AppKit                        0x943335cc -[NSApplication run] + 855
    19  com.apple.AppKit                        0x942d65f6 NSApplicationMain + 1053
    20  com.apple.iPhoto                        0x0008a0b9 0x7a000 + 65721
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