I have an extension for an opensource solution.
It was working with an older version of the solution but with the latest version of the solution it doesn't work anymore.
The extension allow user to save datas into the database. This functionnality works, but the bug is that once datas are saved, they are invisible for the user in the admin interface (even if they are stored into the db) because this is AJAX which allow the user to see the datas stored, and the AJAX system has a bug. Probably something change between the older version of the solution and the latest.
I will provide more informations on demand but this is a very small project. For an AJAX expert it will take at worst 3 hours to find and solve the bug.
Bid only if you know Zend Framework and AJAX !