There has never been a piece of code written that doesn't have some bug(s) in it. To make life easier for users, If a bug is found, the bug is fixed in the code for the next release and we release a patch so you can fix it now.
The turn arround time for themes to be approved can stretch several weeks so this method allows you to get the problem corrected. The latest version of the theme is avaliable here when it is submitted to WordPress so you can get it sooner.
So back to your issue. if you don't want to upgrade (directions
here) then you need to make sure you have applied all the patches for the version you are on. They can be found in the 'New Versions & Updating' forum and sub-forum and will have the verison number as part of the title.