Hi mrmcq,
The problem is the image format: open the top_tab.png file located in superslider-login/plugin-data/superslider/ssLogin/[yourtheme]/images and save it as a .gif file.
That should fix the problem in IE. However, I like the way the .png version looks better in all the other browsers, so what I did was specify different images for each kind of browsers through conditional styling: non-IE browsers are assigned the top_tab.png, and IE browsers the top_tab.gif.
In case you would like some information about how to accomplish this, you can read the following article.
If you have a delicate or complicated theme (like me) and are unable to edit the header.php file directly, then the simplest way to implement conditional styling would be through a function, placed in functions.php or custom-functions.php. Before you modify this/these file(s), remember to back them up first in case something goes wrong:
<?php
function browser_detection_IE() {
$browser = $_SERVER['HTTP_USER_AGENT'];
if (preg_match("/MSIE/i", $browser)) {
?>
<style type="text/css">
<!-- Styles for IE -->
.style 1 { }
.style 2 { }
etc.
</style>
<?php
} else {
?>
<style type="text/css">
<!-- Styles for all the other browsers -->
.style 1 { }
.style 2 { }
etc.
</style>
<?php
}
}
add_action ('wp_head','browser_detection_IE');
?>
You can get the superslider-login styles from any of the .css files located inside each theme.
About the author, I sent him a message through his contact form not such a long time ago and he hasn't got back to me yet, so I don't know if he's in town or just too busy. You can try contacting him through the superslider contact page.
Good luck!
YorkshireLad
mrmcq
Oragu