With Atahualpa 3.5.3, there is an theme option for that purpose:
"Center Column" / "Next-Previous Navigation" / "New: Keep next/prev. links on SINGLE post pages to same post category?"
Unfortunatly, it doesn't work for me.
The links are not visible in the single post view, while I am locking a ast that another one of the same category.
Any idea ?
- Meantime, I have tested with a categery having more post, and in that case, no pb...
How to report a bug?
BTW, I very thank the team for this so great/configurable theme!!!