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Nofollow sites that you don't trust. Some people will also nofollow links to direct competitors, which is understandable. Nofollow can and arguably should be used for user-generated content that you can't monitor regularly, such as blog comments, etc. Don't use it for quality content that your readers would find valuable. Alan is correct that nofollowing links will not give more "link juice" to your own site, so you have little to gain.

Works perfectly thanks.  Guess we will see over time if it stops errors from occuring.

I'm third generation TCU and kind of live and die by the Frogs.