fyi, this is a bug stemming from the Tiny slideshow init call when the navigable buttons are enabled. To fix this, I added a check to see if the number of slides is more than 1 before enabling the prev/next navigation button :
slideshow<?php echo $unique; ?>.init(“slideshow<?php echo $unique; ?>”,”image<?php echo $unique; ?>”,”<?php echo (!empty($options[‘shownav’]) && $options[‘shownav’] == “true” && count($slides) > 1) ? $navb . $unique : ”; ?>”,”<?php echo (!empty($options[‘shownav’]) && $options[‘shownav’] == “true” && count($slides)) ? $navf . $unique : ”; ?>”,”imglink<?php echo $unique; ?>”);
