Hi Davo,
Well done for figuring this out. We introduced the ‘matrix’ selection as you call it in V1.10 after several engineers requested a way of updating a single crosspoint, e.g. Input 1 send to Aux 2. So if you select only the Routing item of an Input, nothing happens. You also have to select the Routing item of the required outputs.
The same should work for the FX e.g. to update, select Routing on the desired Input, and Routing on the desired FX Send.
You mentioned the Level item. Note that Level would only update the channel master level.
Hope this helps.