The Supersleight png fixer halts with an error about "root.all" and it severely messed with the listed plugins below in IE8 and IE9. After the page would load, things would suddenly disappear.
The plugins it messed with are:
- Anything Slider for WordPress - Here it messed up the image tabs and start/stop button
- TheThe Tabs and Accordions - It totally killed the CSS.
- WP Social Slider - It made the Facebook and Twitter graphics disappear.
As a work-around, if you comment out the Supersleight includs on lines 20 and 241 in the wp-sliding-login-dashboard-panel.PHP file, so far, it seems to be working fine (on IE 8 and up).