Front Page Image Slider no longer being displayed

on my website www.franciscanfriars.org the home page used to slide through about 7 large images. Just recently it stopped being properly displayed. Sometimes it is gone completely, sometimes it is showing just the top 1/5 of the images. I currently am using adaptive pro version 2.5.3 with optional shortcode added. I see a version 2.5.5 is available for update... not sure if that is really the issue. Any ideas? This issue does not seem to occur when I'm logged into the website to access dashboard. Any ideas?