diff --git a/phpBB/adm/style/acp_users_signature.html b/phpBB/adm/style/acp_users_signature.html
index e51b5ab68d..3b6303319b 100644
--- a/phpBB/adm/style/acp_users_signature.html
+++ b/phpBB/adm/style/acp_users_signature.html
@@ -27,7 +27,7 @@
 		t: '{LA_BBCODE_T_HELP}',
 		tip: '{L_STYLES_TIP}'
 		<!-- BEGIN custom_tags -->
-			,cb_{custom_tags.BBCODE_ID}: '{custom_tags.BBCODE_HELPLINE}'
+			,cb_{custom_tags.BBCODE_ID}: '{custom_tags.A_BBCODE_HELPLINE}'
 		<!-- END custom_tags -->
 	}
 
diff --git a/phpBB/adm/style/install_update.html b/phpBB/adm/style/install_update.html
index c9059d8801..318795f4cf 100644
--- a/phpBB/adm/style/install_update.html
+++ b/phpBB/adm/style/install_update.html
@@ -201,7 +201,7 @@
 
 					<h2>{files.TITLE}</h2>
 
-					<!-- IF files.STATUS eq 'not_modified' --><div style="float: {S_CONTENT_FLOW_END};">&raquo; <a href="#" onclick="dE('not_modified', 0);">{L_TOGGLE_DISPLAY}</a></div><!-- ENDIF -->
+					<!-- IF files.STATUS eq 'not_modified' --><div style="float: {S_CONTENT_FLOW_END};">&raquo; <a href="#" onclick="dE('not_modified', 0); return false;">{L_TOGGLE_DISPLAY}</a></div><!-- ENDIF -->
 					<p>{files.EXPLAIN}</p>
 
 					<div style="display: <!-- IF files.STATUS neq 'not_modified' -->block<!-- ELSE -->none<!-- ENDIF -->;" id="{files.STATUS}">
diff --git a/phpBB/docs/CHANGELOG.html b/phpBB/docs/CHANGELOG.html
index e7cdbe9a8b..8913c7148d 100644
--- a/phpBB/docs/CHANGELOG.html
+++ b/phpBB/docs/CHANGELOG.html
@@ -92,6 +92,7 @@
 		<li>[Fix] Fixing false new private message indicator (Bug #14627)</li>
 		<li>[Fix] Let newly activated passwords work if users were converted (Bug #14787)</li>
 		<li>[Fix] Quote bbcode fixes. Letting parse quote=&quot;[&quot; and re-allowing whitelisted bbcodes within username portion (Bug #14770)</li>
+		<li>[Sec] Fix bbcode helpline display for custom bbcodes - this requires style changes for any custom style (Bug #14850)</li>
 	</ul>
 
 	<a name="v30rc6"></a><h3>1.ii. Changes since 3.0.RC6</h3>
diff --git a/phpBB/includes/acp/acp_styles.php b/phpBB/includes/acp/acp_styles.php
index 9e04ede90b..f4f7f8e56b 100644
--- a/phpBB/includes/acp/acp_styles.php
+++ b/phpBB/includes/acp/acp_styles.php
@@ -993,6 +993,11 @@ parse_css_file = {PARSE_CSS_FILE}
 			
 			$filename = "{$cache_prefix}_$file.html.$phpEx";
 
+			if (!file_exists("{$phpbb_root_path}cache/$filename"))
+			{
+				continue;
+			}
+
 			$template->assign_block_vars('file', array(
 				'U_VIEWSOURCE'	=> $this->u_action . "&amp;action=cache&amp;id=$template_id&amp;source=$file",
 
diff --git a/phpBB/includes/functions_display.php b/phpBB/includes/functions_display.php
index b75747a862..05630342d1 100644
--- a/phpBB/includes/functions_display.php
+++ b/phpBB/includes/functions_display.php
@@ -826,8 +826,9 @@ function display_custom_bbcodes()
 			'BBCODE_NAME'		=> "'[{$row['bbcode_tag']}]', '[/" . str_replace('=', '', $row['bbcode_tag']) . "]'",
 			'BBCODE_ID'			=> $num_predefined_bbcodes + ($i * 2),
 			'BBCODE_TAG'		=> $row['bbcode_tag'],
-			'BBCODE_HELPLINE'	=> str_replace(array('&amp;', '&quot;', "'", '&lt;', '&gt;'), array('\&', '\"', '\\\'', '<', '>'), $row['bbcode_helpline']))
-		);
+			'BBCODE_HELPLINE'	=> $row['bbcode_helpline'],
+			'A_BBCODE_HELPLINE'	=> str_replace(array('&amp;', '&quot;', "'", '&lt;', '&gt;'), array('&', '"', "\'", '<', '>'), $row['bbcode_helpline']),
+		));
 
 		$i++;
 	}
diff --git a/phpBB/styles/prosilver/template/posting_buttons.html b/phpBB/styles/prosilver/template/posting_buttons.html
index c235e49d04..357d20c93b 100644
--- a/phpBB/styles/prosilver/template/posting_buttons.html
+++ b/phpBB/styles/prosilver/template/posting_buttons.html
@@ -28,7 +28,7 @@
 		e: '{LA_BBCODE_E_HELP}',
 		d: '{LA_BBCODE_D_HELP}'
 		<!-- BEGIN custom_tags -->
-			,cb_{custom_tags.BBCODE_ID}: '{custom_tags.BBCODE_HELPLINE}'
+			,cb_{custom_tags.BBCODE_ID}: '{custom_tags.A_BBCODE_HELPLINE}'
 		<!-- END custom_tags -->
 	}
 
diff --git a/phpBB/styles/subsilver2/template/posting_buttons.html b/phpBB/styles/subsilver2/template/posting_buttons.html
index b57a273e25..5adfeab6cd 100644
--- a/phpBB/styles/subsilver2/template/posting_buttons.html
+++ b/phpBB/styles/subsilver2/template/posting_buttons.html
@@ -26,7 +26,7 @@
 			t: '{LA_BBCODE_T_HELP}',
 			tip: '{L_STYLES_TIP}'
 			<!-- BEGIN custom_tags -->
-				,cb_{custom_tags.BBCODE_ID}: '{custom_tags.BBCODE_HELPLINE}'
+				,cb_{custom_tags.BBCODE_ID}: '{custom_tags.A_BBCODE_HELPLINE}'
 			<!-- END custom_tags -->
 		}