Not sure if others have this issue as well or not but I found a way around this.
If you go into the jj_ngg_jquery_carousel.php
Find:
$output .= "<img src=\"" . $image->imageURL . "\" " . $image_description . $width_d . $height_d . " border=\"0\" />";
Replace with:
$newurl = get_bloginfo("wpurl") . "/" . $image->path . "/thumbs/thumbs_" . $image->filename;
$output .= "<img src=\"" . $newurl . "\" " . $image_description . $width_d . $height_d . " border=\"0\" />";
I’m sure someone else has a more elegant solution but this seemed to work nicely for me. Then I just modified the <a>
to use class=”thickbox” and it popped up the larger image.