Thanks for reporting this. The plugin makes use of the bundled thickbox.js file and the accompanied thickbox.css file from the WP core.
In 3.9 they removed a some of the styling the thickbox display which is causing the captions to be different. I was getting ready to release a 3.9 version, but since you pointed this out I’ll need do some tweaks around the thickbox css.
Thank you for taking the time to respond and explain the issue.
I noticed you fixed the caption, but it doesn’t look like the close box is getting better.
By the way, I don’t know if you fixed that, already, but in the past, I had to change #branding index of built-in theme 2011 to fix the menu bar being displayed above auto-thick view.
@import url("../twentyeleven/style.css");
/* Auto Thickbox stack order fix */
#branding {
z-index: 99;
}
Actually with WP 3.8 and the “modernization” of the dashboard, the close box got relocated to the top right hand corner as also became a dashicon (webfont) as opposed to an image.
I had to essentially fork the thickbox.js and a portion of the .css in this release to maintain some backwards compatibility. On the converse WP uses thickbox for several of it’s internal needs so I opted to keep the revised version of the close box. Pre-WP 3.8 versions should have the old style bottom right close icon.