Yes, we should have seen The National Troupe of Nigeria's production of Ola Rotimi's The Gods Are Not to Blame last September, but immigration snafus--and interesting times--in America and Africa scuttled the gig up to now. Why would an African group have such difficulties staging a theatrical work of political protest in the United States? See for yourself--while you can--when Durham's Rotimi Foundation presents this resetting of Oedipus Rex in the Yoruba tradition Friday and Saturday night at the Durham Arts Center. Tickets range from $10-$20 with children 7 and under free. For reservations, call 680-8080.