diff --git a/anki/groups.py b/anki/groups.py
index b59358059..712ab23fb 100644
--- a/anki/groups.py
+++ b/anki/groups.py
@@ -137,6 +137,9 @@ class GroupManager(object):
         assert gid != 1
         if not str(gid) in self.groups:
             return
+        # delete children first
+        for name, id in self.children(gid):
+            self.rem(id, cardsToo)
         # delete cards too?
         if cardsToo:
             self.deck.remCards(self.cids(gid))
@@ -264,12 +267,18 @@ usn=?,mod=? where id in %s""" % ids2str(cids),
         # current group
         self.deck.conf['curGroup'] = gid
         # and active groups (current + all children)
+        actv = self.children(gid)
+        actv.sort()
+        self.deck.conf['activeGroups'] = [gid] + [a[1] for a in actv]
+
+    def children(self, gid):
+        "All children of gid, as (name, id)."
+        name = self.get(gid)['name']
         actv = []
         for g in self.all():
             if g['name'].startswith(name + "::"):
                 actv.append((g['name'], g['id']))
-        actv.sort()
-        self.deck.conf['activeGroups'] = [gid] + [a[1] for a in actv]
+        return actv
 
     def parents(self, gid):
         "All parents of gid."
diff --git a/anki/importing/anki1.py b/anki/importing/anki1.py
index 7f82d7307..d0fb1c6cb 100644
--- a/anki/importing/anki1.py
+++ b/anki/importing/anki1.py
@@ -26,7 +26,7 @@ class Anki1Importer(Anki2Importer):
         # merge
         deck.close()
         mdir = self.file.replace(".anki", ".media")
-        self.file = deck.path
         self.groupPrefix = os.path.basename(self.file).replace(".anki", "")
+        self.file = deck.path
         Anki2Importer.run(self, mdir)
 
diff --git a/anki/importing/anki2.py b/anki/importing/anki2.py
index 33a2bbe6c..98f41e91e 100644
--- a/anki/importing/anki2.py
+++ b/anki/importing/anki2.py
@@ -41,6 +41,8 @@ class Anki2Importer(Importer):
         self._importFacts()
         self._importCards()
         self._importMedia()
+        self.dst.db.execute("vacuum")
+        self.dst.db.execute("analyze")
 
     # Facts
     ######################################################################
@@ -109,6 +111,8 @@ class Anki2Importer(Importer):
             return dmid
         # need to add to local and update index
         m = self.dst.models._add(self.src.models.get(mid))
+        # need to save so the css is updated
+        self.dst.models.save(m)
         h = self.dst.models.scmhash(m)
         mid = int(m['id'])
         self._dstModels[mid] = h
diff --git a/anki/media.py b/anki/media.py
index e6f2d8943..a50b0df30 100644
--- a/anki/media.py
+++ b/anki/media.py
@@ -168,6 +168,8 @@ If the same name exists, compare checksums."""
 
     def copyTo(self, rdir):
         ldir = self.dir()
+        if not os.path.exists(ldir):
+            return
         for f in os.listdir(ldir):
             src = os.path.join(ldir, f)
             dst = os.path.join(rdir, f)
diff --git a/anki/models.py b/anki/models.py
index 40e144bbe..7db161975 100644
--- a/anki/models.py
+++ b/anki/models.py
@@ -94,7 +94,9 @@ class ModelManager(object):
     def current(self):
         "Get current model."
         try:
-            return self.get(self.deck.groups.top()['curModel'])
+            m = self.get(self.deck.groups.top()['curModel'])
+            assert m
+            return m
         except:
             return self.models.values()[0]