Here's an article on ANA cancelling a flight based on an engine start problem:
What struck me about it was the article's description of Boeing's fix for the batteries (which according to the article, are only used in the 787. Didn't realize that). It described a way of containing an overheat through insulation, steel cage protection, and fume venting. But nothing from the article (granted, a Yahoo! sourced article) that suggests that they corrected the underlying overheat problem.
So, did Boeing actually fix what caused these modern, energy dense batteries to overheat?