If I use basedir="./path/" with <preview url="%BASEDIR%/pano/preview.jpg" type="CUBESTRIP" striporder="FRBLUD" />,It's working.
But if I use basedir="./path" (without ending slash) with <preview url="%BASEDIR%/pano/preview.jpg" type="CUBESTRIP" striporder="FRBLUD" />, It's not working. Seems that the slash previous "pano" is not used.