diff --git a/src/addon/mod/forum/components/index/addon-mod-forum-index.html b/src/addon/mod/forum/components/index/addon-mod-forum-index.html
index 8a7dae440..4c8be80bf 100644
--- a/src/addon/mod/forum/components/index/addon-mod-forum-index.html
+++ b/src/addon/mod/forum/components/index/addon-mod-forum-index.html
@@ -31,17 +31,17 @@
                 <ion-icon name="information-circle"></ion-icon> {{ availabilityMessage }}
             </ion-card>
 
-            <core-empty-box *ngIf="forum && discussions.length == 0 && offlineDiscussions.length == 0" icon="chatbubbles" [message]="'addon.mod_forum.forumnodiscussionsyet' | translate">
-            </core-empty-box>
-
-            <div text-wrap *ngIf="sortingAvailable && selectedSortOrder" ion-row padding-horizontal padding-top margin-bottom>
-                <button *ngIf="sortingAvailable" ion-button padding-horizontal icon-end ion-col (click)="showSortOrderSelector($event)" color="light" class="core-button-select button-no-uppercase" [attr.aria-label]="('core.sort' | translate)" aria-haspopup="true" [attr.aria-expanded]="sortOrderSelectorExpanded" aria-controls="addon-mod-forum-sort-order-selector" id="addon-mod-forum-sort-order-button">
-                    <span class="core-section-selector-text">{{ selectedSortOrder.label | translate }}</span>
-                    <ion-icon name="arrow-dropdown" ios="md-arrow-dropdown"></ion-icon>
-                </button>
-            </div>
-
             <ng-container *ngIf="forum">
+                <core-empty-box *ngIf="discussions.length == 0 && offlineDiscussions.length == 0" icon="chatbubbles" [message]="'addon.mod_forum.forumnodiscussionsyet' | translate">
+                </core-empty-box>
+
+                <div text-wrap *ngIf="sortingAvailable && selectedSortOrder" ion-row padding-horizontal padding-top margin-bottom>
+                    <button *ngIf="sortingAvailable" ion-button padding-horizontal icon-end ion-col (click)="showSortOrderSelector($event)" color="light" class="core-button-select button-no-uppercase" [attr.aria-label]="('core.sort' | translate)" aria-haspopup="true" [attr.aria-expanded]="sortOrderSelectorExpanded" aria-controls="addon-mod-forum-sort-order-selector" id="addon-mod-forum-sort-order-button">
+                        <span class="core-section-selector-text">{{ selectedSortOrder.label | translate }}</span>
+                        <ion-icon name="arrow-dropdown" ios="md-arrow-dropdown"></ion-icon>
+                    </button>
+                </div>
+
                 <ion-card *ngFor="let discussion of offlineDiscussions" (click)="openNewDiscussion(discussion.timecreated)" [class.addon-forum-discussion-selected]="discussion.timecreated == -selectedDiscussion">
                     <ion-item text-wrap>
                         <ion-avatar core-user-avatar [user]="discussion" item-start [courseId]="courseId"></ion-avatar>
@@ -95,9 +95,9 @@
                         </ion-col>
                     </ion-row>
                 </ion-card>
-            </ng-container>
 
-            <core-infinite-loading [enabled]="canLoadMore" (action)="fetchMoreDiscussions($event)" [error]="loadMoreError"></core-infinite-loading>
+                <core-infinite-loading [enabled]="canLoadMore" (action)="fetchMoreDiscussions($event)" [error]="loadMoreError"></core-infinite-loading>
+            </ng-container>
         </core-loading>
 
         <ion-fab core-fab bottom end *ngIf="forum && canAddDiscussion">
diff --git a/src/components/tabs/tab.ts b/src/components/tabs/tab.ts
index 9006b3011..fc4aaf2fc 100644
--- a/src/components/tabs/tab.ts
+++ b/src/components/tabs/tab.ts
@@ -128,6 +128,8 @@ export class CoreTabComponent implements OnInit, OnDestroy {
             });
 
             this.tabs.showHideTabs(scroll);
+        }).catch(() => {
+            // Ignore errors.
         });
     }
 
diff --git a/src/components/tabs/tabs.ts b/src/components/tabs/tabs.ts
index 5d457bfd8..921143228 100644
--- a/src/components/tabs/tabs.ts
+++ b/src/components/tabs/tabs.ts
@@ -417,6 +417,13 @@ export class CoreTabsComponent implements OnInit, AfterViewInit, OnChanges, OnDe
 
         const scroll = parseInt(scrollElement.scrollTop, 10);
         if (scroll == this.lastScroll) {
+            if (scroll == 0) {
+                // Ensure tabbar is shown.
+                this.topTabsElement.style.transform = '';
+                this.originalTabsContainer.style.transform = '';
+                this.originalTabsContainer.style.paddingBottom = this.tabBarHeight + 'px';
+            }
+
             // Ensure scroll has been modified to avoid flicks.
             return;
         }
@@ -438,7 +445,8 @@ export class CoreTabsComponent implements OnInit, AfterViewInit, OnChanges, OnDe
             this.originalTabsContainer.style.transform = 'translateY(-' + scroll + 'px)';
             this.originalTabsContainer.style.paddingBottom = this.tabBarHeight - scroll + 'px';
         }
-        this.lastScroll = scroll;
+        // Use lastScroll after moving the tabs to avoid flickering.
+        this.lastScroll = parseInt(scrollElement.scrollTop, 10);
     }
 
     /**
diff --git a/src/core/block/components/course-blocks/course-blocks.ts b/src/core/block/components/course-blocks/course-blocks.ts
index 574dc3c8b..7db1ffa8c 100644
--- a/src/core/block/components/course-blocks/course-blocks.ts
+++ b/src/core/block/components/course-blocks/course-blocks.ts
@@ -67,6 +67,10 @@ export class CoreBlockCourseBlocksComponent implements OnInit, OnDestroy {
      * Setup scrolling.
      */
     protected initScroll(): void {
+        if (this.blocks.length <= 0) {
+            return;
+        }
+
         const scroll: HTMLElement = this.content && this.content.getScrollElement();
 
         this.domUtils.waitElementToExist(() => scroll && scroll.querySelector('.core-course-blocks-side')).then((sideElement) => {
@@ -89,6 +93,8 @@ export class CoreBlockCourseBlocksComponent implements OnInit, OnDestroy {
                 this.sideScroll.classList.remove('core-course-blocks-fixed-bottom');
                 this.scrollWorking = false;
             }
+        }).catch(() => {
+            // Ignore errors.
         });
     }