Today I have finally deprecated most of the pre-OGR importers. So that means that IMPORTSHP, IMPORTOSM and IMPORTKML are no longer available in scenProc as steps. You have to use IMPORTOGR from now on to read those (and many more formats).
One of the main reasons to deprecate them is to get rid of the dependency on the Microsoft Access database driver, which was used by the shapefile library used by IMPORTSHP. This dependency gave a lot of crashes, since it seems not everybody read the manual to check what other dirvers need to be installed.
With the switch to OGR this problems should be less. However I am seeing some crashes now from people that are related to the OGR libraries as well. These seem to be caused by wrong .NET framework versions. Make sure you have .NET framework 2.0 and 3.5 installed when using scenProc.