Hiya...
So: if I type:
(1+2) + (3 + 4)
I get subgroups.
But i instead select the channels by touching their tombstones on the touchscreen, the brackets all vanish as soon as I touch a channel.
This is bad. (Particularly if you don't notice until you've make a very long chan/subgroup list!).
3.2.12 on an Ion XE with external USB touchscreens.
