I have Simple Slideshow installed on this test site http://isaandcompany.com/sowhat (and the live one). With a recent update (either to WP or the plugin, I’m not sure), inserting a link using the Visual Editor with the plugin activated no longer works. In the WP Visual Editor, when you select text and try to use the Link icon, the page freezes and turns gray.
When the plugin is deactivated, the problem goes away. This issue has also been reported on github: