Try to use low graphical settings.

  • Open LotAtc client
  • Go to the options
  • In general tab set the following options

Restart LotAtc client.

You run DCS in window mode within LotAtc client ?

Your DCS is in window mode and currently displaying 3D view (plane, cockpit….). Open the map in DCS will solve the problems. There is a conflict somewhere in directX between DCS and LotAtc.