Please follow these steps exactly:
While at WinCustomize, open your "edit account" and cross reference your email accounts (SkinBrowser purchase with WC). If you are not sure if this has been done, please do it again. Or, just do it again for the heck of it.
After you are done, close WinCustomize and open it again, then close it. Open the WinCustomize Browser. If this does not fix it, please email support@stardock.com and mention that you already tried this fix.
**Thanks to MadIce for testing this for me.