diff --git a/Htmldocs/release_notes.html b/Htmldocs/release_notes.html
index 94cd1506..a5b13859 100644
--- a/Htmldocs/release_notes.html
+++ b/Htmldocs/release_notes.html
@@ -29,6 +29,7 @@
       <li>[new] Add 95% flow limitation to Therapy Efficacy section on Statistics page.</li>
       <li>[new] Add date range option to Statistics page.</li>
       <li>[new] Improve appearance and operation of event types and graphs comboboxes on Daily and Overview pages.</li>
+      <li>[fix] Fix missing oximetry and motion waveforms on Overview pages.</li>
       <li>[fix] Correct SleepStyle machines sometimes identified as Icon machines.</li>
       <li>[fix] Improve event flag position in flow graph for DV6 machines.</li>
       <li>[fix] --datadir option now allows fully qualified paths on Mac and Linux.</li>
diff --git a/oscar/Graphs/gSessionTimesChart.cpp b/oscar/Graphs/gSessionTimesChart.cpp
index b4ba8a75..06e23aab 100644
--- a/oscar/Graphs/gSessionTimesChart.cpp
+++ b/oscar/Graphs/gSessionTimesChart.cpp
@@ -68,8 +68,16 @@ void gSummaryChart::SetDay(Day *unused_day)
     Q_UNUSED(unused_day)
     Layer::SetDay(nullptr);
 
-    firstday = p_profile->FirstDay(m_machtype);
-    lastday = p_profile->LastDay(m_machtype);
+    if (m_machtype != MT_CPAP) {
+        // Channels' machine types are not terribly reliable: oximetry channels can be reported by a CPAP,
+        // and position channels can be reported by an oximeter. So look for any days with data.
+        firstday = p_profile->FirstDay();
+        lastday = p_profile->LastDay();
+    } else {
+        // But CPAP channels (like pressure settings) can only be reported by a CPAP.
+        firstday = p_profile->FirstDay(m_machtype);
+        lastday = p_profile->LastDay(m_machtype);
+    }
 
     dayindex.clear();
     daylist.clear();