Please share what the activation link the email looks like. If you don’t want to post it publically, send it to me at paul@buddypress.org. We’ve occasionally had reports of this issue but have not yet been able to figure out how to recreate it, so a copy of the email as received by the user would be helpful.
The trac ticket you link to is still open which means the issue hasn’t been fixed in a shipping version of BuddyPress yet. The issue is page title with child pages; upgrades shouldn’t make a difference to this particular problem.
When you say “have their own communities”, do you mean like a BuddyPress multisite mode? If so, that’s not possible, unfortunately. You’d have to use a multi-network configuration (one BP instance per network), but I don’t know enough about these to understand what the dis/advantages might be.
If it’s the EXACT same message, then the bp-registration-options plugin is still active. Try renaming that plugin’s folder in your plugin directory, and then visit /wp-admin/plugins.php
Can you file a bug report to https://buddypress.trac.wordpress.org please, with some example usernames and exact steps how to create the bug. You can use your username and password from this site. Thanks
Versions of BuddyPress prior to 1.2 had a very similar feature. You could try downloading a 1.1.x version of BuddyPress and investigating its templates. Be warned, all most everything’s changed, so you would need to be confident with code to follow through and see what’s changed.
Request for what? If you’re going to resurrect an 8 month old forum post, at least provide more information as to what your concern is, or better yet, start a new thread.
FWIW, BP 1.6 included a fix to some of the most obvious problems around the WP Cache support, but it still needs a full audit.
