diff --git a/backend/middlewares/thumbnail/ThumbnailGeneratorMWs.ts b/backend/middlewares/thumbnail/ThumbnailGeneratorMWs.ts
index 11ea0b0..6cd23b2 100644
--- a/backend/middlewares/thumbnail/ThumbnailGeneratorMWs.ts
+++ b/backend/middlewares/thumbnail/ThumbnailGeneratorMWs.ts
@@ -25,9 +25,8 @@ export class ThumbnailGeneratorMWs {
       return
     }
 
-    Config.Client.concurrentThumbnailGenerations = Math.max(1, os.cpus().length - 1);
-
 
+    Config.Client.concurrentThumbnailGenerations = 1;
     switch (Config.Server.thumbnail.processingLibrary) {
       case ThumbnailProcessingLib.Jimp:
         this.ThumbnailFunction = ThumbnailRenderers.jimp;
@@ -45,6 +44,7 @@ export class ThumbnailGeneratorMWs {
 
     if (Config.Server.enableThreading == true &&
       Config.Server.thumbnail.processingLibrary == ThumbnailProcessingLib.Jimp) {
+      Config.Client.concurrentThumbnailGenerations = Math.max(1, os.cpus().length - 1);
       const Pool = require('threads').Pool;
       this.thPool = new Pool(Config.Client.concurrentThumbnailGenerations);
       this.thPool.run(this.ThumbnailFunction);
diff --git a/frontend/app/gallery/grid/photo/photo.grid.gallery.component.html b/frontend/app/gallery/grid/photo/photo.grid.gallery.component.html
index bec8b9c..e5d944e 100644
--- a/frontend/app/gallery/grid/photo/photo.grid.gallery.component.html
+++ b/frontend/app/gallery/grid/photo/photo.grid.gallery.component.html
@@ -1,5 +1,5 @@
 <div #photoContainer class="photo-container" (mouseover)="hover()" (mouseout)="mouseOut()">
-    <img #img [src]="thumbnail.Src" [hidden]="!thumbnail.Available">
+  <img #img [src]="thumbnail.Src" *ngIf="thumbnail.Available">
 
     <gallery-grid-photo-loading [animate]="thumbnail.loading" *ngIf="!thumbnail.Available">
     </gallery-grid-photo-loading>
diff --git a/frontend/app/gallery/grid/photo/photo.grid.gallery.component.ts b/frontend/app/gallery/grid/photo/photo.grid.gallery.component.ts
index 2aae246..006c4d4 100644
--- a/frontend/app/gallery/grid/photo/photo.grid.gallery.component.ts
+++ b/frontend/app/gallery/grid/photo/photo.grid.gallery.component.ts
@@ -101,6 +101,15 @@ export class GalleryPhotoComponent implements IRenderable, OnInit, OnDestroy {
    }
    */
   public getDimension(): Dimension {
+    if (!this.imageRef) {
+      return <Dimension>{
+        top: 0,
+        left: 0,
+        width: 0,
+        height: 0
+      };
+    }
+
     return <Dimension>{
       top: this.imageRef.nativeElement.offsetTop,
       left: this.imageRef.nativeElement.offsetLeft,
diff --git a/package.json b/package.json
index df1a89f..e2326a3 100644
--- a/package.json
+++ b/package.json
@@ -47,7 +47,6 @@
     "ng2-cookies": "^1.0.12",
     "ng2-slim-loading-bar": "^4.0.0",
     "node-iptc": "^1.0.4",
-    "optimist": "^0.6.1",
     "reflect-metadata": "^0.1.10",
     "rxjs": "^5.4.1",
     "systemjs": "0.20.14",
@@ -66,7 +65,6 @@
     "@types/gm": "^1.17.31",
     "@types/jasmine": "^2.5.52",
     "@types/node": "^8.0.1",
-    "@types/optimist": "0.0.29",
     "@types/sharp": "^0.17.2",
     "@types/winston": "^2.3.3",
     "chai": "^4.0.2",