If you are having issues with the Genesis Slider plugin then it would be best to contact the original developer of the plugin – (http://www.studiopress.com/forums/) since this wasn’t created by us.
Also keep in mind that the Genesis Slider isn’t apart of the theme, nor is it required to be used. Wes only added it in the demo for “demonstration” purposes. You can use any slider plugin you want. As CyndiP menioned, the Meteor Slides plugin is pretty good. There are many more that you can use as well. Although I haven’t personally had any issues with the Genesis Slider myself, so the problem could be a css issue in your custom code.