diff --git a/NEWS b/NEWS
index 96fc938..3a73ab9 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,9 @@
+1.4.3: June 16, 2008:
+ * Fixed a bug in which an image thumbnail could not be loaded unless
+   you had a valid session. This prevented thumbnails from showing up
+   if, for instance, you were reading the Luminotes blog from an RSS
+   reader that didn't establish a session.
+
 1.4.2: June 16, 2008:
  * Fixed a bug that caused image files to get deleted if there were multiple
    images embedded within a single note.
diff --git a/controller/Files.py b/controller/Files.py
index d2eb25f..257b558 100644
--- a/controller/Files.py
+++ b/controller/Files.py
@@ -150,7 +150,7 @@ class FieldStorage( cherrypy._cpcgifs.FieldStorage ):
     # uploading
     try:
       cherrypy.session.release_lock()
-    except KeyError:
+    except ( KeyError, OSError ):
       pass
 
     # pluck the file id out of the query string. it would be preferable to grab it out of parsed
@@ -257,7 +257,7 @@ class Files( object ):
     # download is cancelled before it's done, the lock won't be released
     try:
       cherrypy.session.release_lock()
-    except KeyError:
+    except ( KeyError, OSError ):
       pass
 
     db_file = self.__database.load( File, file_id )
@@ -350,7 +350,7 @@ class Files( object ):
     """
     try:
       cherrypy.session.release_lock()
-    except KeyError:
+    except ( KeyError, OSError ):
       pass
 
     db_file = self.__database.load( File, file_id )
@@ -411,7 +411,7 @@ class Files( object ):
     """
     try:
       cherrypy.session.release_lock()
-    except KeyError:
+    except ( KeyError, OSError ):
       pass
 
     db_file = self.__database.load( File, file_id )
@@ -567,7 +567,7 @@ class Files( object ):
     # upload is cancelled before it's done, the lock won't be released
     try:
       cherrypy.session.release_lock()
-    except KeyError:
+    except ( KeyError, OSError ):
       pass
 
     # poll until the file is uploading (as determined by current_uploads) or completely uploaded (in