Mac Issues - Swithing between Convert and Browse to make it work

[routeconverter]

I have to do the following to delete a point or series of points (say point 51 to 59 as example):
1. Click on the point, say point 51 (at this stage it is not indicated as selected)
4. Select all entries from Position 51 to Position 59 (again the selection is not made)

I am using the following versions/configurations:
RouteConverter 2.18.1
MacBook Pro (13-inch, Late 2011)
OS X El Capitan Version 10.11.5
Java Version 8 Update 91

I've tried this with a 2015 MacBook Pro, same RouteConverter, OS X and Java version. And the selection worked but when selecting on the map and in the position list. I'm wondering what's happening on your machine.

I'd be most grateful if you can advise on what I am doing wrong here.

Please use Help/Send Error Report... which will send me the log from your machine.