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Thanks for the info!
Are you using an AppleScript to send keystrokes at any point? A mistake I've seen there often is that people only write code to "press" a key, but forget to also include the code to subsequently release it.
Have you tried to temporarily back up your settings, then use Remote Buddy with default settings? Does the issue still occur?
Are you, btw, still seeing the issue with Remote Buddy 1.17.1?
Best regards,
Felix Schwarz