User field missing from compose private message

Hi,

I'm using Buddypress with the Business theme and the 'send to user' field is missing from compose private message. I can only send a message to all users by ticking the box.

The words 'Send To (Username or Friend's Name)' are visible, but no field to enter name is there.

Tried deactivating plugin and turning off private messaging and turning back on.

Just installed Landing pages plugin and getting this across top of header for logged in users only.

Warning: Invalid argument supplied for foreach() in /home/content/14/11272314/html/constantdownline/wp-content/plugins/landing-pages/shared/classes/menu.class.php on line 544

Not sure if this is related, although I deactivated Landing pages and the field is still missing.

I would also like to know if there is a way to remove error.

Thanks in advance,
Sean Thompson