From the faq. Q: The Game list won't update, or does not update correctly. For example, I see no categories or years. A: This maybe because you are using an old version of MAME or a derivative build such as MAME Plus. GameEx has only been tested with the newer versions of the official Windows MAME, MAME32 and AdvanceMAME. Get the latest official version of Windows MAME or MAME32. Once the Games list has updated correctly, you can probably swap over to your derivative or older build.