[X-Istence]

Is your apple display an actual Cinema display or one of the newer Thunderbolt displays?

I've noticed some issues with the USB hub that is built into the Thunderbolt display whereby for some reason it doesn't enumerate correctly every 40 - 50 plug/unplug cycles while using my MBPr at work. It only happens when the Apple keyboard is plugged into the display, with alternate keyboards it doesn't happen.

So I personally feel like it is an issue with the Apple keyboard.

[sdegutis]

I don't know, but it shouldn't matter. Apple products are known for how they Just Work™ but in this case it's not true.