A month after promising co-operation that would re-balance global oil markets, the producer coalition forged by Saudi Arabia and Russia is having difficulty taking its first step. OPEC members and rival producers have yet to decide when, or where, to hold talks on a proposed accord to freeze oil output, a strategy aimed at curbing the worldwide oversupply. Dates and locations suggested by one producer — this month or next, in Moscow, Doha or Vienna — are promptly snubbed by another in the fledgling alliance. On Wednesday the process received another setback when a gathering of Latin American producers scheduled for Friday in Quito, Ecuador, was pushed back. OPEC members and Russia reached a tentative agreement on Feb. 16, their first in 15 years, to cap oil output to ease a crude-price slump that’s pummeled economies, markets and companies. Benchmark Brent oil has since recovered from the 12-year low […]