--- a/Plugins/VcsPlugins/vcsMercurial/HgDiffDialog.py	Sat Mar 31 12:08:28 2012 +0200
+++ b/Plugins/VcsPlugins/vcsMercurial/HgDiffDialog.py	Sat Mar 31 15:08:26 2012 +0200
@@ -187,6 +187,7 @@
             if not procStarted:
                 QApplication.restoreOverrideCursor()
                 self.inputGroup.setEnabled(False)
+                self.inputGroup.hide()
                 E5MessageBox.critical(self,
                     self.trUtf8('Process Generation Error'),
                     self.trUtf8(