diff --git a/src/main/java/info/bukova/isspst/security/AuthPopulator.java b/src/main/java/info/bukova/isspst/security/AuthPopulator.java
index 21055a64..625635bb 100644
--- a/src/main/java/info/bukova/isspst/security/AuthPopulator.java
+++ b/src/main/java/info/bukova/isspst/security/AuthPopulator.java
@@ -5,9 +5,6 @@ import info.bukova.isspst.data.User;
 import info.bukova.isspst.services.users.LdapUserImporter;
 import info.bukova.isspst.services.users.RoleService;
 import info.bukova.isspst.services.users.UserService;
-
-import java.util.Collection;
-
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.ldap.core.DirContextOperations;
@@ -15,6 +12,8 @@ import org.springframework.security.core.GrantedAuthority;
 import org.springframework.security.core.userdetails.UsernameNotFoundException;
 import org.springframework.security.ldap.userdetails.LdapAuthoritiesPopulator;
 
+import java.util.Collection;
+
 public class AuthPopulator implements LdapAuthoritiesPopulator {
 
 	private UserService userService;
@@ -30,7 +29,8 @@ public class AuthPopulator implements LdapAuthoritiesPopulator {
 	public Collection<? extends GrantedAuthority> getGrantedAuthorities(
 			DirContextOperations userData, String login) {
 
-		User user = null;
+		User user;
+
 		try {
 			user = (User) userService.loadUserByUsername(login);
 		} catch (UsernameNotFoundException e) {
diff --git a/src/main/java/info/bukova/isspst/services/users/AdUserCtxMapper.java b/src/main/java/info/bukova/isspst/services/users/AdUserCtxMapper.java
index fc95a943..dc6a8a0b 100644
--- a/src/main/java/info/bukova/isspst/services/users/AdUserCtxMapper.java
+++ b/src/main/java/info/bukova/isspst/services/users/AdUserCtxMapper.java
@@ -3,9 +3,6 @@ package info.bukova.isspst.services.users;
 import info.bukova.isspst.Constants;
 import info.bukova.isspst.data.User;
 import info.bukova.isspst.security.AuthMethod;
-
-import java.util.Collection;
-
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.ldap.core.DirContextAdapter;
@@ -16,6 +13,8 @@ import org.springframework.security.core.userdetails.UsernameNotFoundException;
 import org.springframework.security.ldap.authentication.ad.ActiveDirectoryLdapAuthenticationProvider;
 import org.springframework.security.ldap.userdetails.UserDetailsContextMapper;
 
+import java.util.Collection;
+
 /**
  * Mapovač doménových uživatelů Active Directory na uživatele aplikace. Pokud uživatel není v aplikační databází,
  * importu je se tam pomoci {@link LdapUserImporter}. Tento objekt se předává do {@link ActiveDirectoryLdapAuthenticationProvider}.
@@ -40,7 +39,8 @@ public class AdUserCtxMapper implements UserDetailsContextMapper {
 	@Override
 	public UserDetails mapUserFromContext(DirContextOperations userData,
 			String username, Collection<? extends GrantedAuthority> authorities) {
-		
+		username = username.toLowerCase();
+
 		try {
 			User user = (User) userService.loadUserByUsername(username);
 			return user;
diff --git a/src/main/java/info/bukova/isspst/services/users/UserServiceImpl.java b/src/main/java/info/bukova/isspst/services/users/UserServiceImpl.java
index 25faf30b..8b8a491f 100644
--- a/src/main/java/info/bukova/isspst/services/users/UserServiceImpl.java
+++ b/src/main/java/info/bukova/isspst/services/users/UserServiceImpl.java
@@ -7,15 +7,7 @@ import info.bukova.isspst.data.UserSettingsData;
 import info.bukova.isspst.security.AuthMethod;
 import info.bukova.isspst.services.AbstractService;
 import info.bukova.isspst.services.StringXmlMarshaller;
-//import info.bukova.isspst.services.LazyLoader;
-
 import info.bukova.isspst.services.workgroups.WorkgroupService;
-
-import java.util.ArrayList;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Set;
-
 import org.exolab.castor.xml.Marshaller;
 import org.exolab.castor.xml.Unmarshaller;
 import org.hibernate.LazyInitializationException;
@@ -31,6 +23,13 @@ import org.springframework.security.core.userdetails.UserDetails;
 import org.springframework.security.core.userdetails.UsernameNotFoundException;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+//import info.bukova.isspst.services.LazyLoader;
+
 public class UserServiceImpl extends AbstractService<User> implements UserService {
 
 	private PasswordEncoder encoder;
@@ -220,6 +219,7 @@ public class UserServiceImpl extends AbstractService<User> implements UserServic
 	}
 
 	@Override
+	@Transactional
 	public void delete(User entity) {
 		workgroupService.loadParents(entity);