Mac Pro unable to mount etc. blank cd / dvd but reads cd's/DVD's with data

First ... sorry my bad English!
My Mac Pro is unable to mount blank cd's/dvd's but can read+mount cd's/dvd's with data??
It happends with my internal drive and with my Lacie external drive so it is not "hardware" problem.
I think this started after uppdates (security etc.)
I'm running Snow Leopard 10.6.4.
But still I'm able to burn with my Toast software cd's dvd's although cds are not mounted???or seen in finder???
-SsoundD

Start the program you are using to burn the discs, and when you are about to burn them, it will tell you to insert a blank CD/DVD to be burned.
Mac OS X cannot mount Blank CD/DVD, since it does not have any Mac File Structures on it.

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Mac Pro unable to mount etc. blank cd / dvd but reads cd's/DVD's with data

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