I have many hacks, but they're all MATY hacks. Could there still be a conflict?
Yes, if you have an old or obsolete hack in with updated hacks there could still be a conflict. I agree that this is a difficult thing to test, since the social worker does not arrive every day. However, I would recommend deleting your hacks and reinstalling a new set of MATY hacks from the correct directory (whatever your latest EP is). That will ensure that you have purged any old versions.