Hola,
Vete a la ruta /modules/mod_jmslideshow/assets/css/mod_jmslideshow_default.css y realiza los siguientes cambios en las lineas 4 y 21:
.jmslideshow .cycle-prev, .jmslideshow .cycle-prev:hover, .jmslideshow .cycle-prev:visited, .jmslideshow .cycle-prev:active, .jmslideshow .cycle-prev:focus { background: transparent url("../images/control_button.png") repeat scroll 152% 134%; cursor: pointer; height: 49px; left: 30px; opacity: 0.6; overflow: hidden; position: absolute; text-indent: -999px; top: 45%; width: 47px; z-index: 999; } .jmslideshow .cycle-next, .jmslideshow .cycle-next:hover, .jmslideshow .cycle-next:visited, .jmslideshow .cycle-next:active, .jmslideshow .cycle-next:focus { background: transparent url("../images/control_button.png") repeat scroll 98% 134%; cursor: pointer; height: 49px; opacity: 0.6; overflow: hidden; position: absolute; right: 30px; text-indent: -999px; top: 45%; width: 47px; z-index: 9999; }
Genial!!!, Tema solucionado. Muchas Gracias!!