Greetings!
I'll be happy to help you as this Joomla upgrade issue fixing work fits my developer skills.
I'll do this quickly (can start right after hiring, estimated task completion time 1 day) as I'm a PHP/JavaScript/VB/VBA/C/C++/C# developer with 15 years of experience, familiar with most PHP CMSes (Joomla, WordPress, Drupal, SMF, etc), have been writing code for both Windows and *nix (Linux/BSD).
I have strong knowledge of HTML, SQL, mathematics and offer high-quality, low-price solutions.
Please hire me for quick, robust, well-commented code that follows best programming practices.
Thanks.