You should first go into Nero StartSmart and click on the Nero icon in the Top left corner of Nero StartSmart.
This will take you to the Nero Product Center. CLick on the Serial Number Tab, and now you will see two Serial keys. One to unlock Nero 6 Ultra Edtion, and one to unlock the MP3Lame encoder. Write both of these down in a secure location, and keep for future reference.
Now use the below link to download and run our Nero Clean Tool. This will remove all Nero programs from your system, including Drivers and Registry entries.
When a bug is reported by a customer, our Tech Support staff will try and duplicate the issue, and if that is not possible, they will have our QA team try and duplicate the issue. If neither group is able to duplicate the problem, no bug entry is created. They would first come back to you and request you to try some steps to resolve the issue, and if you still have trouble, ask for more detailed information about your system and the steps you take to create the problem.
I've seen others report 'similar' issues, but though they are similar, they are not 'exactly' the same as your issues. In most cases it's not the Generating of Chapters that they complain about, but when encoding there are problems if they create chapters, but when they do not create chapters they have no trouble encoding. That is the most common issue we have seen. We have found some bugs in this area and already addressed them. This has resolved the issue for many, but not everyone.