by Richard Samson.
Rob,
I-ve just been rereading this whole thread and I see that nobody has answered you.
My understanding is theat you should make new groups for the second task.
If students are in more than one group that is no problem but it potentially increases the possible permutations.
In the case of assignments, you need to put the groups into a grouping and, in the Group submission settings, specify the grouping. It would be a different grouping for each task in your case.
Or does somebody want to correct me?