I don't think there is any evidence to date of any ball morphs being infertile. Even ball hybrids can reproduce. Now, will there ever be a point at which morphology interferes with fertility?...that's a good question.
I think the closest thing you'll find regarding fertility issues would come up researching the caramel gene. If you search the forum for female caramel albino infertility a few interesting threads come up with questions regarding females not being able to produce fertile clutches or slugging out consistently. From what I understand they DO lay fertile clutches but it seems they are usually small and have a large ratio of slugs to fertile eggs. However, I've had mixed success with regular morphs and normals too. So, does the caramel gene effect fertility? I don't think there is enough organized data to prove it does.
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