This is more of an FYI than anything elseâ€¦
I had installed WordPress & Gallery via One-Click Install Advanced Mode and added BBPress manually and I was going crazy trying to get them all to play nice together with authentication and single-sign on. Once I manually installed everything, it was smooth sailing.
It looks to me like the One-Click install of WP does not include all the info the BBPress & Gallery integration needs (the wp-config files are quite different between manual and one-click).
Less QQ, more pew-pew