What's going on is that Winterboard has not been updated to run on iOS 7. Most, if not all themes have not been updated to run on iOS. Mobile Substrate has not been updated to run on iOS 7. In fact, if you don't already own a tweak (from a prior iOS version), you can buy it (or download it if it's free) because that aspect of Cydia has not been turned on for iOS 7.
The evasi0n7 jail breaking tool, as you know, was released quickly. No developers had a chance to update their tweaks and themes. Most themes will need updating because of the differences in iOS 7's codling.
So, all we can do is wait patiently while stuff gets updated. It's not you, it's everyone. So, please, hang in there and wait. Things will get sorted.
Marilyn