Magento: Get GTspeed Combine & Minify to work (400 Bad Request Error)

We have installed GTspeed extension on our Magento 1.6.1 install. When we enable Minify CSS and Minify JS, no problems occur. However, when we enable Combine CS and Combine JS, the following errors occur: 400 Bad Request Please see [login to view URL] Live JS URL is here: [login to view URL],/js/lib/[login to view URL],/js/prototype/[login to view URL],/js/scriptaculous/[login to view URL],/js/scriptaculous/[login to view URL],/js/scriptaculous/[login to view URL],/js/scriptaculous/[login to view URL],/js/scriptaculous/[login to view URL],/js/varien/[login to view URL],/js/varien/[login to view URL],/js/varien/[login to view URL],/js/mage/[login to view URL],/js/mage/[login to view URL],/skin/frontend/em0023/default/js/[login to view URL],/skin/frontend/base/default/slideshowwidget/js/[login to view URL],/skin/frontend/base/default/slideshowwidget/js/jquery.wt-rotator.js&1316168241 Live CSS URL is here: [login to view URL],/skin/frontend/em0023/default/css/[login to view URL],/skin/frontend/em0023/default/css/[login to view URL],/skin/frontend/em0023/default/slideshowwidget/css/[login to view URL],/skin/frontend/em0023/default/css/webtexgiftcards.css&0 There are more combined CSS and JS files. Your job is to make the extension work properly to combine & minify all JS to one file, and all CSS to one file successfully.