I had a similar sounding problem and it was down to an error on my part - when I registered the license on the website I entered "servername" but when I built the server using the install discs I entered "servername.ourcompany.co.uk" and of course the server names didn't match. I spoke to our vendor who got in touch with Cisco who supplied a license file wiith the correct name.
Hostname is not case sensitive. Please issue the command 'hostname' on your WCS server. The output of this command needs to exactly match the one in the license file. If it doesn't you need to get your license rehosted. Please open a Cisco TAC case for this.