Like the other thread you mentioned, this problem too seems to not have occurred as a result of the upgrade. The problem maybe something else.
First, you may check to see if the transaction is giving a pop when it is executed via the normal SAP Console. If it does not pop-up there, there is something wrong with the module pool program itself and then you can dig to find the problem.
If it does, the problem may be in the HTML code generated for that page. You may regenerate the template code using an appropriate generation style by overwriting the existing HTML template.
Let me know.
Regards,
Utkarsha