What is causing a replacement ceiling fan light to flicker?
It turns out there is a watt governor (part# 98480-02) which seems to go wonky on Hunter ceiling fans.  I took out the watt governor, hooked nuetral to the wire nut with all the neutrals, and the hot lead to the hot wire nut, and now all is well.  See a description here:

http://www.fixya.com/support/t3831943-fan_lights_just_started_blinking