Index: trac/ticket/api.py
===================================================================
--- trac/ticket/api.py	(revision 1970)
+++ trac/ticket/api.py	(working copy)
@@ -25,6 +25,8 @@
 from trac.core import *
 from trac.perm import IPermissionRequestor
 from trac.wiki import IWikiSyntaxProvider
+from trac.wiki import wiki_to_html
+from trac.wiki import wiki_to_oneliner
 
 class MyLinkResolver(Component):
     """
@@ -121,7 +123,8 @@
                 'name': name,
                 'type': self.config.get('ticket-custom', name),
                 'order': int(self.config.get('ticket-custom', name + '.order', '0')),
-                'label': self.config.get('ticket-custom', name + '.label', ''),
+                'label': wiki_to_oneliner(self.config.get('ticket-custom', name + '.label', ''), 
+                                          self.env, self.env.get_db_cnx()),
                 'value': self.config.get('ticket-custom', name + '.value', '')
             }
             if field['type'] == 'select' or field['type'] == 'radio':
Index: trac/ticket/web_ui.py
===================================================================
--- trac/ticket/web_ui.py	(revision 1970)
+++ trac/ticket/web_ui.py	(working copy)
@@ -348,6 +348,8 @@
             if name in ('summary', 'reporter', 'description', 'type', 'status',
                         'resolution', 'owner'):
                 field['skip'] = True
+            else:
+                field['formatted'] = wiki_to_html(ticket.values.get(name), self.env, req, db)
             req.hdf['ticket.fields.' + name] = field
 
         req.hdf['ticket.reporter_id'] = util.escape(reporter_id)
Index: templates/ticket.cs
===================================================================
--- templates/ticket.cs	(revision 1970)
+++ templates/ticket.cs	(working copy)
@@ -64,7 +64,7 @@
     if:fullrow && idx % 2 ?><th></th><td></td></tr><tr><?cs /if ?>
     <th id="h_<?cs var:name(field) ?>"><?cs var:field.label ?>:</th>
     <td<?cs if:fullrow ?> colspan="3"<?cs /if ?> headers="h_<?cs
-      var:name(field) ?>"><?cs var:ticket[name(field)] ?></td><?cs 
+      var:name(field) ?>"><?cs var:field.formatted ?></td><?cs 
     if:idx % 2 ?></tr><tr><?cs 
     elif:idx == num_fields - 1 ?><th></th><td></td><?cs
     /if ?><?cs set:idx = idx + #fullrow + 1 ?><?cs