diff -r 593386221aa7 -r 81021d62138f server/session.py
--- a/server/session.py	Mon Feb 08 13:03:38 2010 +0100
+++ b/server/session.py	Mon Feb 08 13:33:09 2010 +0100
@@ -475,7 +475,7 @@
                     for operation in processed:
                         operation.handle_event('revert%s_event' % trstate)
                     # res
-                    self.pending_operations = processed + self.pending_operations
+                    self.pending_operations[:] = processed + self.pending_operations
                     self.rollback(reset_pool)
                     raise
             self.pool.commit()