Greetings -- This may be a jQuery issue with our theme, but up to now we've used the (ugly) Flash version of NextGen slideshows to enable display of captions and automatic resizing; see e.g. here. When I enable NextGEN Gallery Optimizer Premium and uncheck "Enable flash slideshow" under Gallery > Options > Slideshow, I get the dreaded spinning loading circle as mentioned in your FAQ, though when I disable your plugin I get the (basic) slideshow back. I've checked and all thumbnails in the test gallery look just fine, and have checked other postings re. slideshows in your support forum and no related clues. Currently you won't see the behavior as I've re-enabled the Flash view, but if you'd like to view it let me know and I'll temporarily disable.