Hi
The thing is when i got my TR a month back , since at the time i wasnt going to go any real cd burning tasks, i didnt really bother installing any app other than the one that comes with TR itself. But then i installed Nero 6 ULTRA just like you have and it worked absolutely fine. But i think you might want to try installing a older version of nero. Like 5 or some subversion of 5. Other than that, the burning app which comes with TR is ok, but not as functional as NERO though it does the job till you find a older version of nero. I dont know where you will get it though. Try searching for it at GOOGLE.
Also for burning music cds i recommend Acoustica MP3 CD burning software. Works like a charm and is quite useful. http://www.download.com , will find it here for sure.
Cheers.