I noticed that I cannot change the description for any distribution lists
that were already in existence when we upgraded to GW 2014. The description
is not even in an editable box.

Any new groups/DLs I create are able to have the description changed. Is
this a known issue? Is there any way around it other than to delete the
group and recreate it?

It's not a big deal, but I have some large groups that I use the description
to denote when the group was last updated.