The fix is ready, but needs to wait until Monday when more staff are available to watch for bugs. Thanks!
Missing pages still there

Each "missing" page requires a minor configuration to allow the other system (either the old site or v3) to know how to correct it. You were right to read it that way — the system is installed, but we still need to add more configuration. I believe a lot of new corrections will be released Monday.

Retraction: "sometines working".
1) I switched to V3, went here:
http://www.chess.com/club/chesscom-v3
2) Now switched to V2, ended up here:
which was a completely different thing and lists things like the Mechanics Institute Chess Club.
3) Switched back to V3, ended up at the unchanged URL:
except that now I saw my groups.
4) Switched back to V2, got a missing page.
The culprit in step 4 is that this http://www.chess.com/clubs loads fine while http://www.chess.com/clubs/ (with trailing slash) produces a missing page in V2.
Reported via snap but thought I'd open a forum too to further explain the sequence of events.
If I navigate to the v3 forum first, and then switch to v3, it gives a missing page. The URL is showing groups instead of clubs. The home icon is missing from the left nav bar. Changing the browser's URL to clubs does not alleviate the missing page. I work around the problem by clicking on daily on the left nav, which gives back a home icon. Then go home, list clubs, expand the list, go to v3 club, and then v3 forum.
I've seen similar things when switching versions in other lower level pages. It seems the only path that is really reliable is switching from home page.
So apparently the back trail matters? Not sure, my programming experience is all back end.