Sounds like the starter solution template files are either missing or in the wrong folder. In my windows system, I can find a group of folders located at: C:\Program Files\FileMaker\FileMaker Pro 11 Advanced\English Extras\Templates
Each of these folders holds a few of the template files made available as starter solution files in this menu. While the location on your mac won't be exactly the same, you should be able to find a Filemaker 11 folder inside your applications folder where these files are located. I'd check there first and see if the files are there.