The button seems__ to toggle, but neither right nor middle click open options or event config. Clicking them has no effect at all. Have tried reinstalling, to no avail.

Hi,
Thanks for the bug report ! To be honest I didn't touch the code since 2 years ago, so it's not surprising that it broke with the last expansion. Since I'm not playing anymore, it's be hard for me to fix it, sorry.
If you or anyone else want to take over the code, be my guest !