Index: typo3/template.php
===================================================================
--- typo3/template.php	(revision 8272)
+++ typo3/template.php	(working copy)
@@ -254,6 +254,11 @@
 			// Initializes the page rendering object:
 		$this->getPageRenderer();
 
+			// Only set the backPath if it is currently empty. May already be set by subclass.
+		if (!$this->backPath) {
+			$this->backPath = $GLOBALS['BACK_PATH'];
+		}
+
 			// Setting default scriptID:
 		if (($temp_M = (string) t3lib_div::_GET('M')) && $GLOBALS['TBE_MODULES']['_PATHS'][$temp_M]) {
 			$this->scriptID = preg_replace('/^.*\/(sysext|ext)\//', 'ext/', $GLOBALS['TBE_MODULES']['_PATHS'][$temp_M] . 'index.php');
@@ -1107,13 +1112,13 @@
 	function addStyleSheetDirectory($path) {
 			// calculation needed, when TYPO3 source is used via a symlink
 			// absolute path to the stylesheets
-		$filePath = dirname(t3lib_div::getIndpEnv('SCRIPT_FILENAME')) . '/' . $GLOBALS['BACK_PATH'] . $path;
+		$filePath = dirname(t3lib_div::getIndpEnv('SCRIPT_FILENAME')) . '/' . $this->backPath . $path;
 			// clean the path
 		$resolvedPath = t3lib_div::resolveBackPath($filePath);
 			// read all files in directory and sort them alphabetically
 		$files = t3lib_div::getFilesInDir($resolvedPath, 'css', FALSE, 1);
 		foreach ($files as $file) {
-			$this->pageRenderer->addCssFile($GLOBALS['BACK_PATH'] . $path . $file, 'stylesheet', 'all');
+			$this->pageRenderer->addCssFile($this->backPath . $path . $file, 'stylesheet', 'all');
 		}
 	}
 
@@ -2263,6 +2268,17 @@
 class frontendDoc extends template {
 
 	/**
+	 * Constructor for frontendDoc. Sets up backPath and calls parent constructor.
+	 */
+	public function __construct() {
+		$this->getPageRenderer();
+		$this->backPath = $GLOBALS['TSFE']->backPath = TYPO3_mainDir;
+		$this->pageRenderer->setBackPath($this->backPath);
+
+		parent::__construct();
+	}
+
+	/**
 	 * Gets instance of PageRenderer
 	 *
 	 * @return	t3lib_PageRenderer
@@ -2282,8 +2298,6 @@
 	 */
 	public function insertHeaderData() {
 
-		$this->backPath = $GLOBALS['TSFE']->backPath = TYPO3_mainDir;
-		$this->pageRenderer->setBackPath($this->backPath);
 		$this->docStyle();
 
 			// add applied JS/CSS to $GLOBALS['TSFE']