http://pastebin.com/8xuFzqhg (infolog)

http://pastebin.com/kLhyf2EK (script.txt)

Playing single-player following the instructions in the wiki for playing vs AI. Other mods work.

The script is there, it's even correct but for whatever reason it isn't recognized after that.

I also have _script.txt in that folder. Not sure if that's important.

I have the maps

I guess that is the error that happens if you select any of the singleplayer battles in the Lua menu?
It does not seem to work on non-windows.
same problem i think: viewtopic.php?f=43&t=25004

I do not even use a file named "script.txt" or "_script.txt", it must be something the engine messes up?
The startscripts are in Missions\ folder and are named:
startscript_castle.txt
startscript_dust.txt
startscript_horus.txt
startscript_moon.txt
startscript_tv.txt

Yes, i'd have to say it is the same issue. It looks like something borked with the way it restarts Spring and passes arguments. By "it" I mean whatever part of Spring and/or mod handles that stuff.

It seems spring on non-windows Spring ignores the passed startscript (in form of a long string) and instead always looks for a "script.txt"
Modwise I do not know what to do, I do not have Linux anyway so can not test it.
To play, you could extract one of the startscripts from the .sdz file and try to somehow feed it to Spring. By drag&drop or via command line.