Southern Africa peace talks appear to be back on track after a public dispute between Angola, Cuba and South Africa threatened to seriously damage the U.S.-mediated negotiations.

In a marked change of mood, the four countries held 21/2 hours of talks Wednesday evening after Angola and Cuba proposed new peace terms, delegates said. U.S. mediator Chester Crocker said discussions could go on late into the night.Earlier, Angola and Cuba rejected a South African peace proposal and accused Foreign Minister Pik Botha of breaking a confidentiality agreement.