diff --git a/interfaces/Config/templates/config_notify.tmpl b/interfaces/Config/templates/config_notify.tmpl
index d4915fc..8606fae 100644
--- a/interfaces/Config/templates/config_notify.tmpl
+++ b/interfaces/Config/templates/config_notify.tmpl
@@ -22,6 +22,7 @@
                 <option value="$ct" <!--#if $ct in $getVar($section_label + '_cats') then 'selected="selected"' else ""#-->>$Tspec($ct)</option>
             <!--#end for#-->
         </select>
+        <p>$T('defaultNotifiesAll')</p>
     </div>
 <!--#end def#-->
 
@@ -40,6 +41,7 @@
                         <option value="$ct" <!--#if $ct in $email_cats then 'selected="selected"' else ""#-->>$Tspec($ct)</option>
                     <!--#end for#-->
                 </select>
+                <p>$T('defaultNotifiesAll')</p>
             </div>
         </div>
         <div class="col1">
diff --git a/interfaces/Config/templates/config_sorting.tmpl b/interfaces/Config/templates/config_sorting.tmpl
index a5c19a4..ce03858 100644
--- a/interfaces/Config/templates/config_sorting.tmpl
+++ b/interfaces/Config/templates/config_sorting.tmpl
@@ -11,12 +11,13 @@
                 <h3>$T('seriesSorting') <a href="$helpuri$help_uri#toc0" target="_blank"><span class="glyphicon glyphicon-question-sign"></span></a></h3>
                 <p>
                     <b>$T('affectedCat')</b><br/>
-                    <select name="tv_categories" multiple="multiple" class="multiple_cats">
+                    <select name="tv_categories" multiple="multiple" class="multiple_cats" required="required">
                         <!--#for $ct in $categories#-->
                         <option value="$ct" <!--#if $ct in $tv_categories then 'selected="selected"' else ""#--> >$Tspec($ct)</option>
                         <!--#end for#-->
                     </select>
                 </p>
+                <p>$T('selectOneCat')</p>
             </div>
             <!-- /col2 -->
             <div class="col1">
@@ -223,12 +224,13 @@
                 <h3>$T('movieSort') <a href="$helpuri$help_uri#toc6" target="_blank"><span class="glyphicon glyphicon-question-sign"></span></a></h3>
                 <p>
                     <b>$T('affectedCat')</b><br/>
-                    <select name="movie_categories" multiple="multiple" class="multiple_cats">
+                    <select name="movie_categories" multiple="multiple" class="multiple_cats" required="required">
                         <!--#for $ct in $categories#-->
                         <option value="$ct" <!--#if $ct in $movie_categories then 'selected="selected"' else ""#--> >$Tspec($ct)</option>
                         <!--#end for#-->
                     </select>
                 </p>
+                <p>$T('selectOneCat')</p>
             </div>
             <!-- /col2 -->
             <div class="col1">
@@ -419,12 +421,13 @@
                 <h3>$T('dateSorting') <a href="$helpuri$help_uri#toc9" target="_blank"><span class="glyphicon glyphicon-question-sign"></span></a></h3>
                 <p>
                     <b>$T('affectedCat')</b><br/>
-                    <select name="date_categories" multiple="multiple" class="multiple_cats">
+                    <select name="date_categories" multiple="multiple" class="multiple_cats" required="required">
                         <!--#for $ct in $categories#-->
                         <option value="$ct" <!--#if $ct in $date_categories then 'selected="selected"' else ""#--> >$Tspec($ct)</option>
                         <!--#end for#-->
                     </select>
                 </p>
+                <p>$T('selectOneCat')</p>
             </div>
             <!-- /col2 -->
             <div class="col1">
diff --git a/sabnzbd/cfg.py b/sabnzbd/cfg.py
index 96abfe5..adcd19f 100644
--- a/sabnzbd/cfg.py
+++ b/sabnzbd/cfg.py
@@ -233,7 +233,7 @@ rating_filter_pause_keywords = OptionStr("misc", "rating_filter_pause_keywords")
 ##############################################################################
 enable_tv_sorting = OptionBool("misc", "enable_tv_sorting", False)
 tv_sort_string = OptionStr("misc", "tv_sort_string")
-tv_categories = OptionList("misc", "tv_categories", "")
+tv_categories = OptionList("misc", "tv_categories", ["tv"])
 
 enable_movie_sorting = OptionBool("misc", "enable_movie_sorting", False)
 movie_sort_string = OptionStr("misc", "movie_sort_string")
diff --git a/sabnzbd/skintext.py b/sabnzbd/skintext.py
index 5d329a7..ccd2c79 100644
--- a/sabnzbd/skintext.py
+++ b/sabnzbd/skintext.py
@@ -705,6 +705,9 @@ SKIN_TEXT = {
     "link-download": TT("Download"),  #: Config->RSS button "download item"
     "button-rssNow": TT("Read All Feeds Now"),  #: Config->RSS button
     # Config->Notifications
+    "defaultNotifiesAll": TT(
+        "If only the <em>Default</em> category is selected, notifications are enabled for jobs in all categories."
+    ),
     "opt-email_endjob": TT("Email Notification On Job Completion"),
     "email-never": TT("Never"),  #: When to send email
     "email-always": TT("Always"),  #: When to send email
@@ -777,6 +780,7 @@ SKIN_TEXT = {
     "catTags": TT("Indexer Categories / Groups"),
     "button-delCat": TT("X"),  #: Small delete button
     # Config->Sorting
+    "selectOneCat": TT("Select at least 1 category."),
     "seriesSorting": TT("Series Sorting"),
     "opt-tvsort": TT("Enable TV Sorting"),
     "sort-legenda": TT("Pattern Key"),
diff --git a/sabnzbd/sorting.py b/sabnzbd/sorting.py
index 59b8d40..faf3c60 100644
--- a/sabnzbd/sorting.py
+++ b/sabnzbd/sorting.py
@@ -363,6 +363,10 @@ class SeriesSorter(BaseSorter):
                 self.matched = True
                 self.type = "tv"
 
+        # Require at least 1 category, this was not enforced before 3.4.0
+        if cfg.enable_tv_sorting() and not self.cats:
+            logging.warning("%s: %s", T("Series Sorting"), T("Select at least 1 category."))
+
     def get_values(self):
         """Collect all values needed for path replacement"""
         self.get_year()
@@ -426,6 +430,10 @@ class MovieSorter(BaseSorter):
                 self.matched = True
                 self.type = "movie"
 
+        # Require at least 1 category, this was not enforced before 3.4.0
+        if cfg.enable_movie_sorting() and not self.cats:
+            logging.warning("%s: %s", T("Movie Sorting"), T("Select at least 1 category."))
+
     def get_values(self):
         """Collect all values needed for path replacement"""
         self.get_year()
@@ -506,6 +514,10 @@ class DateSorter(BaseSorter):
                 self.matched = True
                 self.type = "date"
 
+        # Require at least 1 category, this was not enforced before 3.4.0
+        if cfg.enable_date_sorting() and not self.cats:
+            logging.warning("%s: %s", T("Date Sorting"), T("Select at least 1 category."))
+
     def get_date(self):
         """Get month and day"""
         self.info["month"] = str(self.guess.get("date").month)