Once DNS changes are complete, traffic gradually gets routed through the Incapsula network, as the new DNS records propagate through the Internet. The entire process is TTL-dependent and usually takes a few hours to complete. Nevertheless, no packet drops should occur at any stage.
If you have made the required changes to the DNS properly for a site, but it still appears as Pending DNS changes, please validate that the DNS changes were indeed propagated by using the following tools (make sure to test both the www and the naked domain):
If these services indeed show the records with the values provided by Incapsula throughout the world and the site is still shown as Pending 30 minutes after the change was done, please open a ticket regarding it at support.incapsula.com.