it isn't your installation... it is a part of what is being worked on to specify where you want to spawn in at... technically speaking, use the location tab and put your lat/lon in there... i haven't tested today's new code, yet, but the other day, i found that the location tab wants "lon, lat" instead of "lat, lon"... so for you, in the location search bar, you would put in "15.943665, 51.140221" without the quotes... then the tab will change and show you the map of the area... in the bottom 1/4th of the map will be another box where you set your offset, altitude, speed and other related settings... so you won't need any of those location related settings in the "Additional Settings" box any more... in fact, the launcher will complain if you put them in there
PS: when you put them in the launcher, they're no longer ""command line"" options
"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up."
"Why not?" said Gurder.
"Dunno. It's frightened of heights, I guess."