[Koha] Marc records not appearing in catalog.

We have successfully imported MARC records from Winnebago Spectrum to Koha. But, a lot of imported records in Koha reservoir do not appear in the Koha catalog. They are in the reservoir, but we can't get them into the catalog. The information I have gleaned from Koha blogs suggests that this is an issue with Zebra indexing. Can anyone help? Prasada Sajja Bertha Smith Library Luther Rice Seminary/University