I bumped into this problem and I just can't figure it out...
I've customized the single.php file, so that now when it's in category 3 it automatically loads "single-3.php" which works fine. BUT the problem is that the links above the post which show next and previous posts doesn't distinguish the category, so that if you click through them you end up seeing the posts from other category and that's is a problem because the single post page has a graphical header for category 3.
Is there anyway that I can limit the next/previous links to show only from category 3?
If you have any idea or have experience with this please let me know. Many thanks!