The Obama administration has delayed a step crucial to the launch of the new healthcare law, the signing of final agreements with insurance plans to be sold on federal health insurance exchanges starting October 1.

The U.S. Department of Health and Human Services (HHS) notified insurance companies on Tuesday that it would not sign final agreements with the plans between September 5 and 9, as originally anticipated, but would wait until mid-September instead, according to insurance industry sources.

Nevertheless, Joanne Peters, a spokeswoman for HHS, said the department remains “on track to open” the marketplaces on time on October 1.

The reason for the hold-up was unclear. Sources attributed it to technology problems involving the display of insurance products within the federal information technology system.