Yes, a standard usb connector will not fit due to the small metal protrusion on the inside of the female end, visible in the first image.It appears to be an extender...are you sure your putting the cable in right lol.
Mystery solved, thanks!!That's the Apple wired keyboard extension. I have one right in front of me and it does have the bump. Guess they don't want you using it with anything else!
Mystery solved, thanks!!
Aha, I always wondered why they were so hard to get off when using them for regular cable extensions.If you have pair of needle nosed pliers, you can easily flatten that metal dimple inside and make it into a universal USB extender.