Ax 2009 Hotfix RollUp 5 is one potential problem when applied to a box having multiple AOS or Applications. When It is applied to one AOS/Application and not to others, the client is obviously upgraded. The problem now when the client is on RU 5 and the Application Kernel build is lower than RU5 is that you see only one row of data. Only one record is displayed for any form although when you filter you find the desired data.
This problem can be avoided when the kernel application build is upgraded to RU5.