Index: template.php
===================================================================
--- template.php	(revision 4)
+++ template.php	(working copy)
@@ -1853,7 +1853,10 @@
 			$filename = $GLOBALS['TBE_STYLES']['htmlTemplates'][$filename];
 		}
 		if (substr($filename,0,4) != 'EXT:') {
-			$filename = t3lib_div::resolveBackPath($this->backPath . $filename);
+			if (!t3lib_div::isAbsPath($filename)) {
+				$filename = $this->backPath . $filename;
+			}
+			$filename = t3lib_div::resolveBackPath($filename);
 		} else {
 			$filename = t3lib_div::getFileAbsFileName($filename, true, true);
 		}