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Beginning tomorrow, Linden Labs will be rolling out some changes across the grid in the code for groups that will affect ALL viewers being used in SL right now - including the SL viewers. The rollout should be completed by Friday
What it means is that you will be unable to access the member lists in any group with 10,000 or more in the group.
You will still be able to get group chat. You will be able to send group notices and invite people to join the group if your group role allows it.
You will be unable to assign a role and you will be unable to eject anyone from the group since you will not have access to that particular individual's name. If you are a moderator in the group, you will be unable to exercise any mod abilities such as taking away chat privileges for the same reason..
The SL viewer should be updated soon. Firestorm will be updated but the timeline is unsure at this point (hopefully this weekend but that's not a sure thing yet).
We have no information about any of the other viewers at this time.
Addition: Daniel Voyager reported the reason for the code changes, "The new code changes will fix groups using HTTP which makes it more reliable for loading and editing for 10k+ members in SL groups. This is a switch-over from the old UDP which is not that great for handling large groups with 10k+ members. Its slow loading and harder to edit things with additional issues within groups."