Having checked I can't see another post about this issue; apologies if there is one and I've missed it.
I notice that when I'm amending a WIKI page on a Windows machine the choices are all there as to who I want to select to receive email notification. However, when I'm using OS X Yosemite or iOS 8 the names are there but no check boxes with which to interact and this means notifications are going out which neither I nor the recipient wants.
This wasn't the case until recently and, although I didn't notice precisely when the checkboxes disappeared, I wondered if it might be connected to the recent updates of Mac OS and iOS. If so, when might we expect a fix?