Since build 24, the update released alongside the Humble Indie Bundle, a lot of changes were made to how missions are started in the game. Because of this, many mod missions are incompatible with the current version.
Mod creators will likely update their mods over the coming week or two, so just sit tight until then.

What exactly do we need to do to convert missions for the current build?

Couple lines in ini file of activity.
Like minimal amount of players.
Missions.rte/Mission Activities.ini
Take a look and add important lines into ini file of your mission.



All code that I added to INI file for converting "Astro".
Simple enough, isn't it?

Unmapped lands... you wish.

Most missions need to be recoded Lua-wise too, because they'll get bugs with two players or other such things. Take a look at the scripts in Base.rte/Scenes/Scripts - they make use of new functions that you'll need.

I'm trying to test a scene I'm creating but every time I try the game just crashes, is there something I need to do specifically?
I tried placing some brains for each team but it still didn't work.

I have the same problem of Razumen

Post up a topic in Scene Making - you'll probably get some more help there.

Does this mean scenes work fine? Or both missions and scenes?

Scenes probably won't work for most activities, because they need new Areas. Visit the Scene Making section for info on that.

i installed some mods now when i open up the game it says the last screen has been moved to abortscreen bmp and its missing a thing from the copper head rte help i cant play cortex command

You have installed a mod which does not properly reference all of its parts, and it's causing the game to crash on load. You have two options.

1: dig through the files in your copperhead.rte directory and add the references yourself
2: delete your copperhead.rte directory.

For you, I suggest the latter, as you likely don't have the time or patience for the former.

thanks its fixed now but another thing im not the best coder and dont know muctch about the internal files but i downloaded a map called ww2 bunker but i cant get it to work for skirmish or any other game mode i dont know any fixes so a fix would be greatly appreciated btw if it helps im on a mac

Is there no way to use .ini activities for skirmish defence or do we have to bugger about with the Lua files?

From what I've seen .ini skirmishes still sorta work, but Lua ones are better and won't disappear in future builds.