Logitech Trackman Marble cannot middle-click

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http://askubuntu.com – I have a Logitech Trackman Marble (also known as a MarbleMouse), which lacks a middle button. Previously, I have emulated a middle-click by clicking with both left and right buttons. This works great under KDE Plasma. However, I am sick unto death of Plasma, and recently switched back to OpenBox. Now, my emulated middle click no longer works. I have set Emulate3Buttons true in both /etc/X11/xorg.conf and in /usr/share/X11/xorg.conf.d/50-marblemouse.conf. I know that the latter file is still being read, because I needed a hack in it to scroll, and that still works. I am running xorg 7.7 (HowTos)