Another person was experiencing the custom colour issue which I discovered the problem, albeit a minor problem which I did not put css code in for it (I will be fixing this today).
As for your widgetkit installation issue…there really should not be a problem with this, but to save you time and so you don’t have to keep going through problems here, please send me a login for your admin and link to your admin and I will install and setup the Widgetkit for you. You can send it via email through my contact link in this site’s footer or from the Email Support form (from the support page). However, I may need your FTP info as well because the custom theme I made for the widgetkit slider has to be installed this way.
Quick Note: I just read that you only uploaded a few files? You have to upload the complete widgetkit plugin folder to the plugins folder.