Yeah, looks like one of tilesets is a few tiles too large or too small compared to what the mapmaker was using. Better to repair the map than to wreck tilesets, though...
It's probably the BLANKS in front of all the other MCD files.
I actually only wanted to take a look at the map, to get some inspiration.
I will build a new one from scratch, Mapsize will 50x50 with 5 or 4 levels.
Name will be the Alien Command Ship. I will orientate myself at the initial layout of the vanilla Battleship,
but i will add Labs, Surgery Rooms, Examination Rooms and a Room for the Alien Date Core, which gives the player access to Plasma Weapons, Blaster Launchers and Firestorms (i switched the Crafts around, so you first get the THUNDER, which is a replacement for the lightning and then the Firestorm).
I have seen that you made a template for a 50x50 Vessel for the Ufopaedia, Dioxine if you do not mind i will use this to create a Picture for it once it is designed.
My further idea is to let this UFO occur in a new Missiontype, the player will not be able to shoot it down, but it will land and the player can engage it.
The Crewmix i have in mind, will be a mixture of mainly Mutons, some Muton Elites and Sectoid Elites. Terrorunits will be Chryssalid Spitters, Sectopods and Armored Cyberdiscs.
All reliable killable with Heavy Lasers.
The first occurance could be after the player has researched the Alien Containment, obviously he will not be able to defeat the crew, since he doesn't have Laser Weapons at this point, but maybe he is able to steal the Alien Date Core from the ship, and abort the Mission (That will be a hassle to design in the Map lol), so he gets potential earlie access towards Plasma weaponry.
A second occurance will be after the player has researched the Alien Data Slate and interrogated a Alien Commander.
It is not an MapView issue nor mothership map issue
It happens me too ... on the same development installation,
but with old data folder
that worked some time a go.
I think that there are some change on Tileset because I sometime unzipped some huge mods into it
for curiosity about new maps (Redux, FMP, Hardmod, XenoOp).
I found the issue showing by MapView other maps too ...
I will check if only Ufo maps have issue.
I didn't had any issues with UFO's so from other Mods, like Luke's Extra UFO's or others, that is the first time.
I think that it has todo with the BLANKS in the beginning of the MCD list.