jumping forward or backward a variable amount of time?

When playing a recorded TV show or video, using Jarvis 16.1, if I want to jump forward or backwards a certain amount of time, I use the keyboard command: [number] then right or left arrow – per the kodi keyboard reference page. Example: if I want to jump forward 4 minutes and 10 seconds, I would enter [410], then right arrow – it works as described in the Kodi reference.

But on Krypton RC2 & RC3 if I try to to perform the same jump forward or backward function on the same recording, it doesn’t seem to work.

Is this a bug or a change of function with Krypton? Is there an alternative keyboard command that would allow me to jump forward or backward a specific amount of time?