I am working on Camera/Video application @ work. When I turn on the usb-debugging mode on my droidX it appears that the Camera application cannot access the SD Card on the device. If I choose another USB connection mode, SD card is available but then I cannot debug the application.
I am working on a droidX on Macbook Pro machine.
Change the usb connection from "mass storage" to "Charge Only"
You should be able to debug in that mode. If not, something else is wrong.