Although problems with delayed ignition are most likely to occur with propane (because it is heavier than air), it can still affect natural gas appliances. There are many other factors which may contribute to delayed ignition in the fireplace:
Log placement: logs may be out of position causing problems with flame carry over from the rear of the burner to the front burner.
Too much ember material. Embers may block the flow of fuel and affect the flame carry over.
Ember material or lava rock placed on the rear of the burner.
Strong downdrafts on naturally vented fireplaces can blow fuel away from the pilot light.
Getting the fireplace serviced/cleaned usually resolves the issue.
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