diff --git a/src/helpers/groups.js b/src/helpers/groups.js
index b7668bcc1..555ebac9d 100644
--- a/src/helpers/groups.js
+++ b/src/helpers/groups.js
@@ -1,4 +1,8 @@
-export const isExam = ({ privateData: { examBegin, examEnd } }) => {
+import { safeGet } from './common';
+
+export const isExam = group => {
+  const examBegin = safeGet(group, ['privateData', 'examBegin']);
+  const examEnd = safeGet(group, ['privateData', 'examEnd']);
   const now = Date.now() / 1000;
   return examBegin && examEnd && examEnd > now && examBegin <= now;
 };
diff --git a/src/pages/GroupExams/GroupExams.js b/src/pages/GroupExams/GroupExams.js
index 7fc7ac7a1..554fd0169 100644
--- a/src/pages/GroupExams/GroupExams.js
+++ b/src/pages/GroupExams/GroupExams.js
@@ -25,13 +25,19 @@ import { groupExamLocksSelector } from '../../redux/selectors/groupExamLocks';
 import { lockedStudentsOfGroupSelector } from '../../redux/selectors/usersGroups';
 import { loggedInUserIdSelector } from '../../redux/selectors/auth';
 import { isLoggedAsSuperAdmin, loggedInUserSelector } from '../../redux/selectors/users';
+import { getJsData } from '../../redux/helpers/resourceManager';
 
 import withLinks from '../../helpers/withLinks';
 import { hasPermissions, safeGet } from '../../helpers/common';
 import ResourceRenderer from '../../components/helpers/ResourceRenderer';
 import { isExam } from '../../helpers/groups';
 
+const REFRESH_INTERVAL = 1; // [s]
+
 class GroupExams extends Component {
+  state = { examInProgress: false };
+  intervalHandler = null;
+
   static loadAsync = ({ groupId }, dispatch) =>
     Promise.all([
       dispatch(fetchGroupIfNeeded(groupId)).then(({ value: group }) =>
@@ -41,11 +47,31 @@ class GroupExams extends Component {
       ),
     ]);
 
+  static getDerivedStateFromProps({ group }) {
+    const groupJs = getJsData(group);
+    const examInProgress = Boolean(groupJs && isExam(groupJs));
+    return { examInProgress };
+  }
+
+  periodicRefresh = () => {
+    const newState = GroupExams.getDerivedStateFromProps(this.props, this.state);
+    if (newState.examInProgress !== this.state.examInProgress) {
+      this.setState(newState);
+    }
+  };
+
   componentDidMount() {
     this.props.loadAsync();
     if (this.props.params.examId) {
       this.props.loadGroupExamLocks();
     }
+
+    if (window && 'setInterval' in window) {
+      if (this.intervalHandler) {
+        window.clearInterval(this.intervalHandler);
+      }
+      this.intervalHandler = window.setInterval(this.periodicRefresh, REFRESH_INTERVAL * 1000);
+    }
   }
 
   componentDidUpdate(prevProps) {
@@ -57,6 +83,13 @@ class GroupExams extends Component {
     }
   }
 
+  componentWillUnmount() {
+    if (this.intervalHandler) {
+      window.clearInterval(this.intervalHandler);
+      this.intervalHandler = null;
+    }
+  }
+
   linkFactory = id => {
     const {
       params: { groupId, examId = null },
@@ -114,19 +147,19 @@ class GroupExams extends Component {
                   unlimitedHeight>
                   <GroupExamsTable
                     exams={group.privateData.exams}
-                    selected={isExam(group) ? null : examId}
-                    linkFactory={isExam(group) ? null : this.linkFactory}
+                    selected={this.state.examInProgress ? null : examId}
+                    linkFactory={this.state.examInProgress ? null : this.linkFactory}
                   />
                 </Box>
               </Col>
             </Row>
 
-            {(examId || isExam(group)) && hasPermissions(group, 'viewStudents', 'setExamPeriod') && (
+            {(examId || this.state.examInProgress) && hasPermissions(group, 'viewStudents', 'setExamPeriod') && (
               <Row>
                 <Col xs={12}>
                   <Box
                     title={
-                      isExam(group) ? (
+                      this.state.examInProgress ? (
                         <FormattedMessage
                           id="app.groupExams.studentsBoxTitle"
                           defaultMessage="Participating students"
@@ -140,7 +173,7 @@ class GroupExams extends Component {
                     }
                     noPadding
                     unlimitedHeight>
-                    {isExam(group) ? (
+                    {this.state.examInProgress ? (
                       <LockedStudentsTable
                         groupId={group.id}
                         lockedStudents={lockedStudents}
diff --git a/src/pages/Login/Login.js b/src/pages/Login/Login.js
index 61636cd3d..dad46ecc3 100644
--- a/src/pages/Login/Login.js
+++ b/src/pages/Login/Login.js
@@ -12,10 +12,15 @@ import PageContent from '../../components/layout/PageContent';
 import LoginForm from '../../components/forms/LoginForm';
 import ExternalLoginBox from '../../containers/ExternalLogin';
 import Callout from '../../components/widgets/Callout';
+import Button from '../../components/widgets/TheButton';
+import Icon from '../../components/icons';
 
-import { login } from '../../redux/modules/auth';
+import { login, logout } from '../../redux/modules/auth';
 import { isLoggedIn, selectedInstanceId } from '../../redux/selectors/auth';
 import { loggedInUserSelector } from '../../redux/selectors/users';
+
+import { getError } from '../../redux/helpers/resourceManager';
+
 import { getConfigVar, getConfigVarLocalized } from '../../helpers/config';
 import { getErrorMessage } from '../../locales/apiErrorMessages';
 
@@ -95,24 +100,41 @@ class Login extends Component {
   render() {
     const {
       isLoggedIn,
+      loggedInUser,
+      logout,
       params: { redirect = null },
       links: { RESET_PASSWORD_URI },
-      intl: { locale },
+      intl: { locale, formatMessage },
     } = this.props;
 
     const external = EXTERNAL_AUTH_URL && EXTERNAL_AUTH_SERVICE_ID;
+    const userError = getError(loggedInUser);
 
     return (
       <PageContent icon="sign-in-alt" title={<FormattedMessage id="app.login.title" defaultMessage="Sign In" />}>
         <>
           {isLoggedIn ? (
-            <Row>
-              <Col sm={12}>
-                <Callout variant="success">
-                  <FormattedMessage id="app.login.alreadyLoggedIn" defaultMessage="You are already logged in." />
-                </Callout>
-              </Col>
-            </Row>
+            userError ? (
+              <Row>
+                <Col sm={12}>
+                  <Callout variant="danger">
+                    <p>{getErrorMessage(formatMessage)(userError)}</p>
+                    <Button variant="danger" onClick={logout}>
+                      <Icon icon="sign-out-alt" gapRight />
+                      <FormattedMessage id="app.logout" defaultMessage="Logout" />
+                    </Button>
+                  </Callout>
+                </Col>
+              </Row>
+            ) : (
+              <Row>
+                <Col sm={12}>
+                  <Callout variant="success">
+                    <FormattedMessage id="app.login.alreadyLoggedIn" defaultMessage="You are already logged in." />
+                  </Callout>
+                </Col>
+              </Row>
+            )
           ) : (
             <>
               {redirect && (
@@ -171,13 +193,14 @@ class Login extends Component {
 }
 
 Login.propTypes = {
-  login: PropTypes.func.isRequired,
   params: PropTypes.shape({
     redirect: PropTypes.string,
   }),
   isLoggedIn: PropTypes.bool.isRequired,
   instanceId: PropTypes.string,
   loggedInUser: ImmutablePropTypes.map,
+  login: PropTypes.func.isRequired,
+  logout: PropTypes.func.isRequired,
   reset: PropTypes.func.isRequired,
   links: PropTypes.object.isRequired,
   intl: PropTypes.object,
@@ -193,6 +216,7 @@ export default withLinks(
     }),
     dispatch => ({
       login: ({ email, password }) => dispatch(login(email, password)),
+      logout: () => dispatch(logout()),
       reset: () => {
         dispatch(reset('login'));
       },