@Don Lee this is a common error on latest imageshow gk4, i have being working on it last night and managed to fix the problems in my localhost installations. ( about 15
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Problem: When clicking on Preview buttons or when clicking on browse buttons to select an image transparent modal effect occurs without any modal window.
Possible Problem: Files saved with Ansi encoding and or file : modules\mod_image_show_gk4\admin\style.css has unclosed css tags such as { color: #333; text-shadow: 0 1px 1px #fff or { color: #333; text-shadow: 0 1px 1px #fff }
You can try attached css file. Extract the css file and copy it to "modules\mod_image_show_gk4\admin\style.css". Make sure to refresh your browser cache while at image show module settings page.