Terrain issues are always caused with conflicting addons. The most common conflict for NZAA is Orbx NZNI (New Zealand North Island). Thankfully we've implemented tools to prevent this. Solution 1: Open the Flightbeam Manager and use the Troubleshooting tool to de-activate conflicting files. Green means the file has been de-activated.Additionally, ensure that your Scenery Library has a proper order. Airport entries (in gray, unmovable) MUST be above Orbx entries. To move down, simply select Orbx entries and click "Move Down"The vast majority of cases, this works and no further action is needed.Please note that you may notice issues with Orbx NZNI after disabling files. Solution 2: Only needed if solution 1 did not work. Find your install folder where Orbx installed NZNI. Search for each file and rename their extension from ".bgl" to ".off"4_mesh_multiLOD4-12_FTX-NZNI_section2.bgl300_FTX_NZNI_LCpoly_9445_Auckland.BGL0_excl_FTX_NZNI_GUID_all.BGLcvx_FTX_NZNI_water_9445_summer.BGL4_mesh_multiLOD4-12_FTX-NZNI_section2.bgl2_FTX_NZNI_orthoimage_NZNI_LINZ_ManukauHarbour_2m.bglADE_FTX_NZNI_NZAA_GSE_Clutter.BGLADE_FTX_NZNI_NZAA_Markings_Clutter.BGLADE_FTX_NZNI_NZAA_Objects.BGLADE_FTX_NZNI_NZAA_Terminals.BGLADE_FTX_NZNI_NZAA.BGLADE_FTX_NZNI_NZAA_CVX.bglADE_FTX_NZNI_NZAA_GP.bglADE_FTX_NZNI_NZAA_Vegetation.BGL