diff --git a/ui/src/views/Forecast.jsx b/ui/src/views/Forecast.jsx
index ffedd80..59e8d0f 100644
--- a/ui/src/views/Forecast.jsx
+++ b/ui/src/views/Forecast.jsx
@@ -685,8 +685,9 @@ export default function Forecast({ sources = [], sourceId, versions = [], versio
   }
 
   async function initViewer(vid, sid) {
+    dbgOrder('initViewer start', { vid, sid, hasViewer: !!viewerRef.current })
     const viewer = viewerRef.current
-    if (!viewer) return
+    if (!viewer) return dbgOrder('initViewer: no viewer element')
     const myId = ++initIdRef.current
     setLoading(true)
     setLargeDataset(false)
@@ -724,7 +725,7 @@ export default function Forecast({ sources = [], sourceId, versions = [], versio
 
       if (rowCount >= 500000) setLargeDataset(true)
 
-      if (myId !== initIdRef.current) return
+      if (myId !== initIdRef.current) return dbgOrder('initViewer: superseded before table')
 
       if (!workerRef.current) workerRef.current = await perspective.worker()
       const worker = workerRef.current
@@ -797,6 +798,7 @@ export default function Forecast({ sources = [], sourceId, versions = [], versio
       // by the very next line and the ordering columns never appeared in the
       // column list.
       try {
+        dbgOrder('reached the sync call')
         await syncOrderExpressions()
       } catch (err) {
         // Its own try covers only restore(); save() and the builders sit outside