diff --git a/core/block.class.php b/core/block.class.php
index afdb23db..1fbe0e3f 100644
--- a/core/block.class.php
+++ b/core/block.class.php
@@ -20,7 +20,7 @@ class Block {
 	 */
 	public $body;
 
-	/** 
+	/**
 	 * Where the block should be placed. The default theme supports
 	 * "main" and "left", other themes can add their own areas.
 	 *
@@ -58,7 +58,7 @@ class Block {
 		$this->body = $body;
 		$this->section = $section;
 		$this->position = $position;
-		$this->id = str_replace(' ', '_', is_null($id) ? (is_null($header) ? md5($body) : $header) . $section : $id);
+		$this->id = preg_replace('/[^\w]/', '',str_replace(' ', '_', is_null($id) ? (is_null($header) ? md5($body) : $header) . $section : $id));
 	}
 
 	/**
@@ -94,4 +94,3 @@ class NavBlock extends Block {
 		parent::__construct("Navigation", "<a href='".make_link()."'>Index</a>", "left", 0);
 	}
 }
-
diff --git a/ext/blotter/theme.php b/ext/blotter/theme.php
index 27987687..ba274cf8 100644
--- a/ext/blotter/theme.php
+++ b/ext/blotter/theme.php
@@ -62,7 +62,7 @@ class BlotterTheme extends Themelet {
 			if($entries[$i]['important'] == 'Y') { $important = 'Y'; } else { $important = 'N'; }
 
 			// Add the new table row(s)
-			$table_rows .= 
+			$table_rows .=
 				"<tr>
 				<td>$entry_date</td>
 				<td>$entry_text</td>
@@ -114,7 +114,7 @@ class BlotterTheme extends Themelet {
 				$i_open = "<font color='#{$i_color}'>";
 				$i_close="</font>";
 			}
-			$html .= "{$i_open}{$clean_date} - {$entry_text}{$i_close}<br /><br />";			
+			$html .= "{$i_open}{$clean_date} - {$entry_text}{$i_close}<br /><br />";
 		}
 		$html .= "</pre>";
 		return $html;
@@ -139,9 +139,9 @@ class BlotterTheme extends Themelet {
 			$entry_text = $entries[$i]['entry_text'];
 			if($entries[$i]['important'] == 'Y') {
 				$i_open = "<font color='#{$i_color}'>";
-				$i_close="</font>"; 
+				$i_close="</font>";
 			}
-			$entries_list .= "<li>{$i_open}{$clean_date} - {$entry_text}{$i_close}</li>";			
+			$entries_list .= "<li>{$i_open}{$clean_date} - {$entry_text}{$i_close}</li>";
 		}
 
 		$pos_break = "";
@@ -149,7 +149,7 @@ class BlotterTheme extends Themelet {
 
 		if($position === "left") {
 			$pos_break = "<br />";
-			$pos_align = ""; 
+			$pos_align = "";
 		}
 
 		if(count($entries) === 0) {
@@ -176,4 +176,3 @@ class BlotterTheme extends Themelet {
 		return $html;
 	}
 }
-
diff --git a/themes/material/layout.class.php b/themes/material/layout.class.php
index defac581..5d88d965 100644
--- a/themes/material/layout.class.php
+++ b/themes/material/layout.class.php
@@ -233,8 +233,7 @@ EOD;
   public function get_html(Block $block, $section="main", $hidable=false, $extra_class="") {
     $h = $block->header;
     $b = $block->body;
-    $i = $block->id;
-    $i = preg_replace('/[^\w-]/', '', $i);//blotter extention id has `!`
+    $i = $block->id;//blotter extention id has `!`
 
     if($section == "toolbar"){
       $html = "<section id='$i'>\n<nav class='mdl-navigation'>\n";