[gibbousmoon]

I’m working with a brand new install of WP 3.9.2, and I don’t recall whether I installed BP or the Custom Community theme first, but when I have both enabled, I get this error:

Notice: Indirect modification of overloaded property BuddyPress::$add_root has no effect in /home/nanoedmo/public_html/wp-content/plugins/buddypress/bp-core/bp-core-functions.php on line 564

If I switch to another theme, the error disappears. Initially the error would just load at the top of the page while the site continued to function, but now the error is the ONLY thing that displays on any page, which renders my site completely unusable. It’s quite possible that the change in behavior corresponded to when the host site upgraded me to WP 4.0.

Now, the facts.

* Hosted by SiteGround
* WordPress 4.0
* Directory install
* In a subdirectory
* Upgraded from WP 3.9.2
* BP 2.0.2
* Other plugins activated: Akismet, bbPress, BP Custom Profile Menu, BP Group Email Subscription, BP Toolbar, Captcha Pro, Counterize (and its plugins), Limit Login Attempts, NaNo Stats, ProgPress, Shortcode Reference, The Events Calendar, WordPress SEO.
* Using Custom Community theme
* Core files untouched
* No custom functions in bp-custom.php
* bbPress version 2.5.4
* This error is almost the only one in php_errorlog. Occasionally I see this one:
PHP Warning: Cannot modify header information – headers already sent by (output started at /home/nanoedmo/public_html/wp-content/plugins/buddypress/bp-core/bp-core-functions.php:564) in /home/nanoedmo/public_html/wp-includes/pluggable.php on line 1173

[danbp]

Deactivate all plugins but buddypress and activate 2014 and retest your install.
See if the notices disappear and if the site loads correctly.
If not, deactivate buddypress and retest.

If ok, activate custom community and retest only with wp.
If the errors are back, you have the culprit.
If it is ok, activate BP. Retest.

If ok, you reactivate one by one your plugins. Except BP Toolbar, outdated and still in beta since april 2013. This plugin was intended for BP 1.5 to 1.7. And BuddyPress is use now the wp Toolbar.

If nothing of this is working correctly, you have to ask on the theme support.