Make sure the CXMB that you've downloaded is actually for 5.0m33... Same thing happen to me, you just have to find the actual cxmb made for 5.0m33... Here's mine if you want.. I have 5.0m33-4 and it works fine...
Also, make sure you add this on your vsh.txt inside the seplugins folder, not sure if you've done that..
ms0:/CXMB/CXMB.prx
Hope this helps, if you're still having problems let me know..
Rep + if this helped..
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