Cody-7,
I tried to reproduce your problem on my machine and could not (Running XP Pro with IP version 2.50h.087).
You could try the following:
1. Under Tools menu - use "repair icon images, and rebuild icon cache"
2. Uninstall and download again - I get an automatic install now, though I am currently unclear whether this is a user level or software benefit. If you get the automatic install, the IP panel in your image should pop-up with the images displayed.
3. Look in C:\Program Files\Stardock\Object Desktop\Icon Packager\Themes and make sure that the "Darkness Icons" folder installed to that location. The folder should include an Axialis Library icon and an Icon Packager Icon.
3. Uninstall IconPackager through Stardock Central (do not select the option to "delete all installed skins, themes and games", reboot computer, and reinstall IconPackager.
The last option usually clears any issues.
BTW, I see that a new version of Stardock Central was just released. You might try updating if you have not already done so. This may help as well.
Good luck.