--- typo3_src-4.3.2/t3lib/class.t3lib_extmgm.php	2010-02-23 12:00:04.000000000 +0100
+++ patch/t3lib/class.t3lib_extmgm.php	2010-03-13 09:43:47.000000000 +0100
@@ -136,6 +136,21 @@
 	}
 
 	/**
+	 * Displays the last function calls before the error has occurred.
+	 */
+	public static function echoBacktrace ()	{
+		$backtrace = debug_backtrace();
+		echo '<strong>Backtrace:</strong><br />';
+		for ($i = 11; $i >= 0; --$i)	{
+			if (is_array($backtrace[$i]))	{
+				$file = file($backtrace[$i]['file']);
+				$out = htmlspecialchars($backtrace[$i]['file'].' : '.$backtrace[$i]['line']).'<br />';
+				echo $out;
+			}
+		}
+	}
+
+	/**
 	 * Returns the absolute path to the extension with extension key $key
 	 * If the extension is not loaded the function will die with an error message
 	 * Useful for internal fileoperations
@@ -146,10 +161,11 @@
 	 * @return	string
 	 */
 	public static function extPath($key, $script = '') {
-		global $TYPO3_LOADED_EXT;
+		global $TYPO3_LOADED_EXT, $_EXTKEY;
 		if (!isset($TYPO3_LOADED_EXT[$key])) {
 			#debug(array(debug_backtrace()));
-			die('TYPO3 Fatal Error: Extension key "'.$key.'" was NOT loaded! (t3lib_extMgm::extPath)');
+			self::echoBacktrace();
+			die('TYPO3 Fatal Error: Extension key "'.$key.'" was NOT loaded for extension "' . $_EXTKEY .'"! (t3lib_extMgm::extPath)');
 		}
 		return PATH_site.$TYPO3_LOADED_EXT[$key]['siteRelPath'].$script;
 	}
@@ -164,9 +180,10 @@
 	 * @return	string
 	 */
 	public static function extRelPath($key) {
-		global $TYPO3_LOADED_EXT;
+		global $TYPO3_LOADED_EXT, $_EXTKEY;
 		if (!isset($TYPO3_LOADED_EXT[$key])) {
-			die('TYPO3 Fatal Error: Extension key "'.$key.'" was NOT loaded! (t3lib_extMgm::extRelPath)');
+			self::echoBacktrace();
+			die('TYPO3 Fatal Error: Extension key "'.$key.'" was NOT loaded for extension "' . $_EXTKEY .'"! (t3lib_extMgm::extRelPath)');
 		}
 		return $TYPO3_LOADED_EXT[$key]['typo3RelPath'];
 	}