Regarding logout, it would appear that you always need to login and logout with MODX. Which means you need to set the Module’s "Login page" and "Logout page" as required. Using the out-of-the-box test site as an example, that would be document ID#4 for both. That makes the main SMF toolbar login/logout buttons redirect to the MODX login/logout page.
And do NOT use the "quick login" on the SMF templates!
"Hide Forms" doesn’t seem to have any effect.
I’ve found when playing around that they can get out of sync, especially if you don’t set the "Logout page" correctly. And double-especially if you use the SMF "quick login" form on the standard template. To get back in sync, you need to log out of MODX, then log back in to MODX as the same user. Then go to the forum, click logout, and it should be in sync. Maybe...
Or, just trying it again now, maybe not.
Hmm, I guess when I thought I got it to work before, it was actually just the cookie expiring. I can switch to a different user using the correct login/logout procedure, but then it just reverts me to the previously-logged in user.
I guess the first order of buisness is to get rid of that "quick login"...