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Well there are only three possibilites.
1. Hole in the membrane or at a seam. I'm sure they would have seen this though.
2. The water is entering around the perimiter and flowing under the roof.
3. Something sticking out of the roof like a vent or skylight needs to be re-tarred or calked. There could also be an issue with the vent or skylight itself leaking.
Do you have access to the underside of the roof? When it rains you could look to see where the water is coming from. It could be several feet away from the room's drip spot.
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