By the videos of the birthday party, I think there might have been some tension already, but it seems like they fought after, or during it (but after the media part)... or Ayu is just very good at keeping appearances.
Oh well, likely we'll never kow the full details, but seems the main reason was Alvin down right lying about the trip reasons just to get publicity out of Ayu... and, let's face it, he got a lot more publicity than her with the whole birthday party and "I'm like family to Ayumi Hamasaki!" thing...
But Ayu got the LaPerla exposition and ELLE live, so it wasn't all bad.
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