I just received a Leopold FC750R today, and after some short usage, I noticed that double tapping control or scroll lock causes the scroll lock key to start flashing, and then the next keypress isn't registered. The behavior suggests that the controller is expecting a specific key for a configuration shortcut or something. The light stops flashing after pressing most keys, but not all. A, T, F, P, C, and B do not stop the light from flashing. Nothing noticeable happens to the keyboard or OS. I can't find anything about this mode in the official documentation or online. This seems like a very popular keyboard, so I wondered if anyone here has figured it out.
