The 'Import track/route' option on the right hand side of the same box has disappeared? Or are you trying to steer all these functions to WITHIN Route Planner (File/Upload)? (BTW, In English, I think File/Import is more the convention).
Can you please describe from where you get taken to Version 2.3. I could not find it. Is it from a training detail page when you create a new route from a training?