Once you've produced a DVD-R from the original DVD-9 using DVD Shrink, you should be able to copy the disc using Nero or similar.
There are several issues here:
- Your Shrink produced DVD is evidently playable but there may be errors in the burning that aren't detectable until you try to copy it. Did you verify disc to ensure all the data could be read back? Your DVD burner may not work well with the media used to produce the copy.
- Your copy may have been damaged at some point in between production and 2nd generation copying.
- You may have changed media to reproduce the copy and the new media is giving you problems.
I'm being generalistic because your question is quite vague. It doesn't specify what media you used for the first copy and the media you're using for the second. Also you don't say how it doesn't work. Does it burn and then you can't play it or are you having problems during burning?