I had new IDX Mark II (premium kit w/64gb fast card and reader, $5999 US) backordered since B&H opened orders for this camera (Feb. 2016). The camera and kit arrived via UPS Wed. May 4. The box and packaging design is more complex than I like. Carefully unboxed and began putting the camera together:
1. Inserted the battery, no problem
2. Turned camera on, no problem
3. Tried to insert CFast card into slot#2, problem!
4. CFast card did "feel seated" properly, although the orange lift button did come up a little bit
5. Note: CFast cards have 2 rows of female contact slots. A long row and short row that mate with male edge contacts within camera's slot#2.
6. I checked to ensure I was inserting the card with proper orientation. Looking at the back of the camera with eye piece up, the card door is to the right. Insert the card with short row slot down.
7. Tried several times to insert the card without using too much force. Each time the card felt only partially inserted. The card door made "slight contact" with the top of the card as you closed and latched the door.
8. Tried: Menu > Format, get message "no card in camera, slot #2"
9. Called Canon customer service, no real help. They couldn't tell me anything I didn't already know or try. In fact, I knew more about 1D series cameras than they did. (I own 10D, 1D mark II, 1D mark IV, and now 1DX mark II — I shoot sports car races.)
10. Called B&H customer service. They were professional, listened to me, and issued a return RMA without hassle. B&H will replace the complete order. Although 1DX II's are still backordered.
11. My complete original order has been returned to B&H via RMA. I just received email confirmation it has arrived at B&H, NYC.
12. Current status: waiting for replacement
13. Note: I tested the new CFast card and reader connected to my computer. Seemed to work fine. I was able to copy files to the card, read from the card, and format the card while connected to my computer.
14. My best guess (suspicion): Problem may be that the slot#2 internal edge connectors are not "perfectly parallel" with insertion axis of the slot. Which would bind and prevent full insertion and complete contact. Only a guess.