Hi, just wanted to say I have the EXACT same problem with 6.6.1.4. I've been testing all evening yesterday and eventually ended up suspecting it was a Nero bug. This thread confirms that I guess.

Everything works fine if you open Nero first and then import the .NRG file. Also, when using ALT+TAB in Windows, Nero doesn't show up. It also occurs when using the "Image recorder".

Before I found this thread I was planning to roll back to an earlier Nero version. I'll see if I can find that 6.6.0.18, if it really is that much better. Thanks!

edit: Just installed 6.6.0.18, problem seems to have gone.