Whenever Wallsaver is displaying a screen saver as my desktop background, my active corner that I've set to activate my screen saver no longer works. Why is this and how do I fix it?

This bug is a known issue.

Since Wallsaver uses Mac OS X's built-in screen saver engine, the system thinks the screen saver is already running, even if it's being displayed as your wallpaper. To get around this issue, Wallsaver's "Extras" menu has an option to "Launch Screen Saver."

We're working on a menu bar option & global keyboard shortcut that you will be able to configure to launch your normal screen saver.