diff --git a/aqt/overview.py b/aqt/overview.py
index e85ff6943..748d2cf52 100644
--- a/aqt/overview.py
+++ b/aqt/overview.py
@@ -23,6 +23,7 @@ class Overview(object):
         self.refresh()
 
     def refresh(self):
+        self.mw.col.reset()
         self._renderPage()
         self._renderBottom()
         self.mw.web.setFocus()
diff --git a/aqt/reviewer.py b/aqt/reviewer.py
index 66b74d93f..a3b77a612 100644
--- a/aqt/reviewer.py
+++ b/aqt/reviewer.py
@@ -26,6 +26,7 @@ class Reviewer(object):
         addHook("leech", self.onLeech)
 
     def show(self):
+        self.mw.col.reset()
         self.mw.keyHandler = self._keyHandler
         self.web.setLinkHandler(self._linkHandler)
         self.web.setKeyHandler(self._catchEsc)