diff --git a/modules/HortaTracer/src/main/java/org/janelia/horta/blocks/KtxOctreeBlockTileSource.java b/modules/HortaTracer/src/main/java/org/janelia/horta/blocks/KtxOctreeBlockTileSource.java
index 00b821520..3c1850f0b 100644
--- a/modules/HortaTracer/src/main/java/org/janelia/horta/blocks/KtxOctreeBlockTileSource.java
+++ b/modules/HortaTracer/src/main/java/org/janelia/horta/blocks/KtxOctreeBlockTileSource.java
@@ -90,8 +90,6 @@ private KtxHeader loadKtxHeader(KtxOctreeBlockTileKey octreeRootKey) {
     private KtxOctreeResolution getKtxResolution(KtxHeader ktxHeader) {
         // Parse maximum resolution
         int maxRes = Integer.parseInt(ktxHeader.keyValueMetadata.get("multiscale_total_levels").trim()) - 1;
-        if (maxRes==0)
-            maxRes = 1;
         return new KtxOctreeResolution(maxRes);
     }
 
diff --git a/modules/HortaTracer/src/main/java/org/janelia/horta/blocks/OctreeDisplayBlockChooser.java b/modules/HortaTracer/src/main/java/org/janelia/horta/blocks/OctreeDisplayBlockChooser.java
index dab95334a..c2e068883 100644
--- a/modules/HortaTracer/src/main/java/org/janelia/horta/blocks/OctreeDisplayBlockChooser.java
+++ b/modules/HortaTracer/src/main/java/org/janelia/horta/blocks/OctreeDisplayBlockChooser.java
@@ -22,7 +22,7 @@ public class OctreeDisplayBlockChooser implements BlockChooser<KtxOctreeBlockTil
 
     private void initBlockSizes(KtxOctreeBlockTileSource source, Vantage vantage) {
         int numLevels = (int)source.getZoomLevels();
-        for (int i=1; i<numLevels; i++) {
+        for (int i=2; i<numLevels; i++) {
             float blockHeight = source.getBlockSize(new KtxOctreeResolution(i)).getY();
             zoomLevels.add((float)(blockHeight * BLOCK_WIDTH_ACROSS_VIEWPORT));
             LOG.info("ZOOM LEVEL {} is {}",i,(float)(blockHeight * BLOCK_WIDTH_ACROSS_VIEWPORT));
diff --git a/modules/ViewerController/src/main/java/org/janelia/workstation/controller/tileimagery/TileServer.java b/modules/ViewerController/src/main/java/org/janelia/workstation/controller/tileimagery/TileServer.java
index 1a8c398d6..6346ea8a4 100644
--- a/modules/ViewerController/src/main/java/org/janelia/workstation/controller/tileimagery/TileServer.java
+++ b/modules/ViewerController/src/main/java/org/janelia/workstation/controller/tileimagery/TileServer.java
@@ -426,7 +426,7 @@ public void volumeLoaded(URL url) {
         // Initialize pre-fetchers
         minResPreFetcher.setLoadAdapter(sharedVolumeImage.getLoadAdapter());
         futurePreFetcher.setLoadAdapter(sharedVolumeImage.getLoadAdapter());
-        //clearCache();
+        clearCache();
         refreshCurrentTileSet();
     }