Nice to hear that your problem is solved but 1.5.9 released way back in 06/07/2012 and so many things have changed since then.
I suggest you use a tool like quickdiff.com to find the differences between your theme and the original one and move those to a child theme ASAP.
Else somewhere down the line a WordPress or a plugin update might break the entire site because WordPress might remove deprecated functions in future releases.