[Plugin: Cool Video Gallery] Cannot Upload Preview Image – Blank Transparent Black Screen

I have the same problem as donsony has. This is a nice plugin. Hope this problem can be resolved very quickly.

Upload manually, if your video url is as below:
/wp-content/uploads/video-gallery/your-video/test.flv

Then upload the thumbnail image as below:
/wp-content/uploads/video-gallery/your-video/thumbs/thumbs_test.png

Make sure that is PNG file, JPEG doesn’t work for the newer version. Thumbnail name should be “thumbs_test.png” for video test.flv

wp-content/plugins/cool-video-gallery/css/thickbox.css

#TB_window {
position: fixed;
background: #ffffff;
z-index: 102;
color:#000000;
/*display:none;*/
text-align:left;
top:50%;
left:50%;
border: 1px solid #555;
-moz-box-shadow: rgba(0,0,0,1) 0 4px 30px;
-webkit-box-shadow: rgba(0,0,0,1) 0 4px 30px;
-khtml-box-shadow: rgba(0,0,0,1) 0 4px 30px;
box-shadow: rgba(0,0,0,1) 0 4px 30px;
}

Thank you Luca – this fixed it up for me.

Cheers!