Yup rite bro, even i hv heard of Incompatibility related to the use of Nero 7, Also as people revert back (roll back) to an older version of Nero (like Nero 6) the problem is solved. There are sum knownas well as unknown glitches in this version of Nero.
Please try to revert back to a previous version of Nero (if u hv one) and jus wait for updates/patches for Nero 7 to be released (if they havent been released yet).
BTW, wat other errors/problems u get while working with version 7 of NERO ??
Cheers n e-peace......