diff --git a/src/calibre/gui2/__init__.py b/src/calibre/gui2/__init__.py
index ef6f37da8c..ebe877f823 100644
--- a/src/calibre/gui2/__init__.py
+++ b/src/calibre/gui2/__init__.py
@@ -100,27 +100,31 @@ def available_width():
 def extension(path):
     return os.path.splitext(path)[1][1:].lower()
 
-def warning_dialog(parent, title, msg):
+def warning_dialog(parent, title, msg, det_msg=''):
     d = QMessageBox(QMessageBox.Warning, 'WARNING: '+title, msg, QMessageBox.Ok,
                     parent)
+    d.setDetailedText(det_msg)
     d.setIconPixmap(QPixmap(':/images/dialog_warning.svg'))
     return d
 
-def error_dialog(parent, title, msg):
+def error_dialog(parent, title, msg, det_msg=''):
     d = QMessageBox(QMessageBox.Critical, 'ERROR: '+title, msg, QMessageBox.Ok,
                     parent)
+    d.setDetailedText(det_msg)
     d.setIconPixmap(QPixmap(':/images/dialog_error.svg'))
     return d
 
-def question_dialog(parent, title, msg):
+def question_dialog(parent, title, msg, det_msg=''):
     d = QMessageBox(QMessageBox.Question, title, msg, QMessageBox.Yes|QMessageBox.No,
                     parent)
+    d.setDetailedText(det_msg)
     d.setIconPixmap(QPixmap(':/images/dialog_information.svg'))
     return d
 
-def info_dialog(parent, title, msg):
+def info_dialog(parent, title, msg, det_msg=''):
     d = QMessageBox(QMessageBox.Information, title, msg, QMessageBox.NoButton,
                     parent)
+    d.setDetailedText(det_msg)
     d.setIconPixmap(QPixmap(':/images/dialog_information.svg'))
     return d
 
diff --git a/src/calibre/gui2/device.py b/src/calibre/gui2/device.py
index 3541d8105f..1a79631e8a 100644
--- a/src/calibre/gui2/device.py
+++ b/src/calibre/gui2/device.py
@@ -507,10 +507,10 @@ class DeviceGUI(object):
             self.status_bar.showMessage(_('Sending email to')+' '+to, 3000)
 
         if bad:
-            bad = '\n'.join('<li>%s</li>'%(i,) for i in bad)
+            bad = '\n'.join('%s'%(i,) for i in bad)
             d = warning_dialog(self, _('No suitable formats'),
-                '<p>'+ _('Could not email the following books '
-                'as no suitable formats were found:<br><ul>%s</ul>')%(bad,))
+                _('Could not email the following books '
+                'as no suitable formats were found:'), bad)
             d.exec_()
 
     def emails_sent(self, results, remove=[]):
@@ -694,12 +694,12 @@ class DeviceGUI(object):
                 self.auto_convert(_auto_ids, on_card, format)
 
         if bad:
-            bad = '\n'.join('<li>%s</li>'%(i,) for i in bad)
+            bad = '\n'.join('%s'%(i,) for i in bad)
             d = warning_dialog(self, _('No suitable formats'),
                     _('Could not upload the following books to the device, '
                 'as no suitable formats were found. Try changing the output '
                 'format in the upper right corner next to the red heart and '
-                're-converting. <br><ul>%s</ul>')%(bad,))
+                're-converting.'), bad)
             d.exec_()
 
     def upload_booklists(self):
diff --git a/src/calibre/gui2/main.py b/src/calibre/gui2/main.py
index 1d0281ead7..ce8cb418ba 100644
--- a/src/calibre/gui2/main.py
+++ b/src/calibre/gui2/main.py
@@ -445,14 +445,8 @@ class Main(MainWindow, Ui_MainWindow, DeviceGUI):
     def change_output_format(self, x):
         of = unicode(x).strip()
         if of != prefs['output_format']:
-            if of not in ('LRF', 'EPUB', 'MOBI'):
-                warning_dialog(self, 'Warning',
-                    ('<p>%s support is still in beta. If you find bugs, '
-                    'please report them by opening a <a href="http://cal'
-                    'ibre.kovidgoyal.net">ticket</a>.')%of).exec_()
             prefs.set('output_format', of)
 
-
     def test_server(self, *args):
         if self.content_server.exception is not None:
             error_dialog(self, _('Failed to start content server'),
@@ -916,14 +910,14 @@ class Main(MainWindow, Ui_MainWindow, DeviceGUI):
                                         callback=callback,
                                         single_format=single_format)
                 if failures and single_format is not None:
-                    msg = _('<p>Could not save the following books to disk, '
-                       'because the %s format is not available for them:<ul>')\
+                    msg = _('Could not save the following books to disk, '
+                       'because the %s format is not available for them')\
                                %single_format.upper()
+                    det_msg = ''
                     for f in failures:
-                        msg += '<li>%s</li>'%f[1]
-                    msg += '</ul>'
+                        det_msg += '%s\n'%f[1]
                     warning_dialog(self, _('Could not save some ebooks'),
-                            msg).exec_()
+                            msg, det_msg).exec_()
                 QDesktopServices.openUrl(QUrl('file:'+dir))
             else:
                 paths = self.current_view().model().paths(rows)
diff --git a/src/calibre/gui2/tools.py b/src/calibre/gui2/tools.py
index 230ab9d5f6..8e19519ecc 100644
--- a/src/calibre/gui2/tools.py
+++ b/src/calibre/gui2/tools.py
@@ -12,6 +12,7 @@ import cPickle, os
 from PyQt4.Qt import QDialog
 
 from calibre.ptempfile import PersistentTemporaryFile
+from calibre.gui2 import warning_dialog
 from calibre.gui2.convert import load_specifics
 from calibre.gui2.convert.single import NoSupportedInputFormats
 from calibre.gui2.convert.single import Config as SingleConfig
@@ -60,10 +61,12 @@ def convert_single_ebook(parent, db, book_ids, auto_conversion=False, out_format
         res = []
         for id in bad:
             title = db.title(id, True)
-            res.append('<li>%s</li>'%title)
+            res.append('%s'%title)
 
-        msg = _('<p>Could not convert %d of %d books, because no suitable source format was found.<ul>%s</ul>')%(len(res), total, '\n'.join(res))
-        warning_dialog(parent, _('Could not convert some books'), msg).exec_()
+        msg = '%s' % '\n'.join(res)
+        warning_dialog(parent, _('Could not convert some books'),
+            _('Could not convert %d of %d books, because no suitable source format was found.' % (len(res), total)),
+            msg).exec_()
 
     return jobs, changed, bad