Problem similar to "Recent posts of same category, on single post pages"

Hi,

I recently had problem and found solution on this forum.... It is on this page ... But could you help me with this:

I placed piece of code that I found on page I previously linked, but I have some posts that belong to two categories - one of them is Featured.... What is worse, it is in most cases, first category, so, this code doesn't display "recent posts of same category" - it displays posts that belong to Featured category.... Unfortunately, I don't know how to solve this problem all by myself.... So, if someone could help me, I would appreciate that...

Thanks in advance,

Regards

Sike