I found this and need to contact FileMsker support:
Re: IWP / CWP Conflict FMSA 12
Under normal circumstances Webko would be correct. However, we have found that some people have recieved an incorrect license key for FMS12A which allows either CWP or IWP, but not both. We already have a fix for this that will be included in an upcoming vrev. In the meantime, anyone whose FMS12A installation is exhibiting this behavior should contact FileMaker Customer Support and request an updated license key that will resolve this issue. As far as we have been able to determine, this problem does not occur with the FMS12A development license keys that were distributed toFileMaker Developer Subscribers.