Do you choose "Startup IRK On"?
I think my problem isn't about the keyboard, because I don't connect SL-6000L to the keyboard or even extend/open that keyboard.
I only install the driver, set it to SL5600/SLC7xx, and click "On" (not Startup IRK ON), then I get the error message "Couldn't open IrDA serial Port. Either something else is using the...."
The only way to make the driver work is "Startup IRK On" and reboot. Is this the correct way I should do?