diff --git a/js/browser.js b/js/browser.js
index <HASH>..<HASH> 100644
--- a/js/browser.js
+++ b/js/browser.js
@@ -1738,6 +1738,7 @@ Browser.prototype.realMakeTier = function(source) {
     this.tierHolder.appendChild(viewport);    
     this.tiers.push(tier);  // NB this currently tells any extant knownSpace about the new tier.
     this.refreshTier(tier);
+    this.arrangeTiers();
 }
 
 Browser.prototype.removeTier = function(tier) {
diff --git a/js/tier.js b/js/tier.js
index <HASH>..<HASH> 100644
--- a/js/tier.js
+++ b/js/tier.js
@@ -19,7 +19,7 @@ function DasTier(browser, source, viewport, background)
     this.viewport = viewport;
     this.background = background;
     this.req = null;
-    this.layoutHeight = 50;
+    this.layoutHeight = 25;
     this.bumped = true; 
     if (this.dasSource.collapseSuperGroups) {
         this.bumped = false;
Ensure newly-added tiers show up even if it takes a while for the data to arrive.