Do you have more than one of the E Films adapters? If so are they reacting the same way with the Macbook Pro's Express slot? We've had posters on this forum before with Express 34 ejection issues with Sony SxS Pro cards as well. They ended up taking their laptops into Apple to get the dodgy Express 34 eject mechanism adjusted. This may not be your issue but just to let you know that not all Express 34 slots are perfect.