Okay, my daughter helped me out with this one and thought I would pass along the solution. It appears that my cd-rom version of PGA had something to do with it. We own the PGA Collector's Edition cd-roms. We uninstalled all the Opfer courses and then began to reinstall them in order of their release (Abernathy, Benson Hills, Cranfield Pines, Deerfield Trace, Eden Valley, Gloucester Golf and Hunt Club and then stopped here). We then re-installed Ingall's Creek FROM the Collector's Edition cd. Then we installed Harper's grove, Joshua Ridge and Kaulani Bay and woila they all worked. As best as my daughter can figure it is an issue with the libraries and the date of the one on the cd as opposed to the ones that come with the files for the other courses. Did Mr. Opfer change libraries or something? Is this an issue similar to the Alan Toft thing that the community needs to be aware of? It appears that there are two distinct versions of the Parkland and Opfer 1 libraries and that if not installed in the manner described above will overwrite and lend some of Mr. Opfer's courses (along with other courses that use these libraries unplayable). Or it could have been the reinstall of the Beartooth Pass and Rugged Cross libraries that come with the xcr file of Ingall's Creek in the cd-rom version that did the trick. Hope this is coherent enough - we got it fixed - heads up to a potential problem with the following libraries then:
Opfer 1
Parkland
Beartooth Pass
Rugged Cross
Heads up to the PGA Collector's Edition cd-rom issue:
reinstall Ingall's Creek and the libraries in the xcr file.
Please post any thoughts here so we have a thread for future reference - a lot of the early courses use the Parkland library and many courses use the Beartooth Pass and Rugged Cross libraries as well. This issue might baffle someone without a technology sharp teenager at home

If we have not explained this correctly or if it is a known issue already, please chime in.