This fix has been reset somehow, so applying it again:

- Check study instances whether they have image data based on sopClassUid or rows (JPEG and PNG images do not have sopClassUid)

Packages/viewerbase/lib/createStacks.js

@@ -30,8 +30,8 @@ createStacks = function(study) {
         // series into another display set.
         let stackableInstances = [];
         series.instances.forEach(instance => {
-            // All imaging modalities must have a valid value for rows (or columns)
-            if (!instance.rows) {
+            // All imaging modalities must have a valid value for sopClassUid or rows
+            if (!isImage(instance.sopClassUid) && !instance.rows) {
                 return;
             }