If you are using the UddeIM private messaging system (PMS) on your Joomla site together with Community Builder you might come along with the installation of UddeIM profile link plugin for CB.
This plugin adds a link to the PMS to the user profile, which makes it possible to write a message to a user while viewing his profile.
Depending on your Webserver setup this can lead to Warning messages like: open_basedir restriction
This warning may be shown when clicking on a user name, which usually directs you to the users profle page.
To get rid of this warnings try the following: First make a backup of the original "pms.uddeim.profilelink.php" file which is in: components\com_comprofiler\plugin\user\plug_uddeimprofilelink
Have alook for the code around line 182 which should begin with: if (file_exists($this->pathtoadmin.'./language'.$postfix.'/'.$this->mosConfig_lang.'.php')) {
Replace the /lanuage entries with ./language, which means: simply add a dot "." before the slash. In the code below, those dots are already added.
If you have done so, the warning messages should be gone. This procedure works for me, but I can't give any guarantee that it works for everyone. Again: Before editing be sure to have a backup of the original file.