I am having problems using Gaussian 98W with Chem3D Ultra's Gaussian client.
If you were previously using Gaussian 94W, and upgraded or installed Gaussian 98W, Chem3D may be confused over which application to use. To correct the problem, go into your Windows (or WinNT) directory on your hard drive and delete the chem3d.ini and gaussian.ini files. You will need to have your Chem3D serial number and reg code handy when launching Chem3D again. Deleting these files will reset things.