We noticed today that the event scheduler looks very different. Notably, you cannot select custom email lists, which makes it very awkward to have meetings for subgroups.
Please add this ability to select custom email lists to the scheduler.
Yours in Scouting,
Kris De Lisle
If this just happened then perhaps someone changed the setting for Dynamic Meeting Invitations.
Gear Menu - Edit Troop (Pack, Unit) Settings - TroopTrack Settings - General Settings - Use dynamic meeting invitations. That is the preferred setting as newly added members are automatically added to events with Everyone selected, it does change the Event creation quite a bit.
Hi Aaron - sorry for a delayed response to this. Your answer was to a different question 
When we set up an event, there are now more choices for distribution lists, but we still cannot select custom email lists. Please add this capability. It used to exist before the event invite was modified.
@KristineDeLisle Yes, the custom e-mail lists are not available when using Dynamic Meeting Invitations, which is a setting in the location I listed in my response. What I was trying to say is perhaps someone in your group enabled that setting, if they did then that was why it changed and the Custom lists went away.
The request for Custom lists to be available with the Dynamic Meeting invitations has been asked many times however at this point it will not be developed soon.