Index: core/units/helpers/user_helper.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- core/units/helpers/user_helper.php	(revision 15892)
+++ core/units/helpers/user_helper.php	(revision )
@@ -160,10 +160,15 @@
 		function loginUserById($user_id, $remember_login_cookie = false)
 		{
 			$object =& $this->getUserObject();
-			$this->Application->removeObject($object->getPrefixSpecial());
 
-			$this->Application->StoreVar('user_id', $user_id);
 			$this->Application->SetVar('u.current_id', $user_id);
+
+			if ( !$this->Application->isAdmin ) {
+				// needed for "profile edit", "registration" forms ON FRONT ONLY
+				$this->Application->SetVar('u_id', $user_id);
+			}
+
+			$this->Application->StoreVar('user_id', $user_id);
 			$this->Application->Session->SetField('PortalUserId', $user_id);
 
 			if ($user_id != USER_ROOT) {