If rebooting your Kemper and PC, doesn't fix the problem:
Find Device Manager in Windows, look in Sound,video and Game Controllers - is there a yellow exclamation mark on the Kemper Profiler?
If the Kemper does have a yellow exclamation mark, right click the Kemper Profiler and uninstall it, you shouldn't need to remove the driver, but if all else fails, uninstall the driver too. Then reinstall RM 1.6.