Program crashes just after the start of the Attrexian Colony level
when searching for an Attraxian engineer. Check controls and are told you need an Attrexian engineer. Leave the controls and go round to a 'courtyard' between buildings. Go down a slope to this 'courtyard' and game crashes with a message
Container::ObjectAt : index out of range.
Downloaded savegames and skipped this part of the level.
The next part also crashes with the same message.
Can anyone help ?

This error occurs if you use a save game from before the Paych 1.1 or before you installed a mod, like the HZM Coop Mod.
Remove the mod and try again.

Thanks for the reply
I am playing the game straight 'out of the box'. The only mods are to not play intro movies and to
set the resolution in the cfg file.
The save game was one produced while running the game.
I will uninstall and reinstall, try again with a new game and see what happens.

This is a listing of all the maps in the game.
The list comes form the HZM Coop Mod and includes the Singeplayer levels, which is the ones you want to load manually if you have troubles with the game loading saved games.

Enter into the console:
g_gametype 0;map <mapname>

For example, mission 1 level 1a:
g_gametype 0;map m1l1a-borg_sphere

This is how you open the console in game:
https://www.gog.com/forum/star_trek_elite_force_ii/console

The IGM you can't load reliably as they require certain variables to be set as they are always the same maps with just different load and spawn setups.

For some reason I could not create a new Topic it would get stuck at processing my post, or I would have made a new Topic in the Forum so this can be easily found.

//SINGLEPLAYER
//SINGLEPLAYER
//SINGLEPLAYER
//Credits
credits
//Prolouge
m0-intro
//Secret levels
secret1
secret2
ef2_minigame2
zoo1
secret3
testmorph
//Training with Tuvok
ent-training1
ent-training2
ent-training3
ent-training4
//Mission 1 Borg Sphere
m1l1a-borg_sphere
m1l1b-borg_sphere
m1l1c-borg_sphere
m1l2a-borg_sphere
m1l2b-borg_sphere
m1l2c-borg_sphere
m1l3-borg_boss
//Mission 2 Starfleet Academy
m2l0-sfa
m2l1-sfa
m2l2-sfa
//Information Gathering Missions
ent-deck
ent-deck1_bridge
ent-deck7a
ent-deck7b
ent-deck7c
ent-deck8
ent-deck11
ent-training_weap1
ent-training_weap2
ent-training_weap3
ent-training_weap4
//Mission 3 USS Dallas
m3l1a-forever
m3l1b-forever
m3l2-forever
//Mission 4 Attraxian Station
m4l1a-attrexian_station
m4l1b-attrexian_station
m4l2b-attrexian_station
//Mission 5 Idryll Ruins 1
m5l1a-drull_ruins1
m5l1b-drull_ruins1
m5l2a-drull_ruins1
m5l2b-drull_ruins1
m5l2c-drull_ruins1
//Mission 6
m6-deck8_redalert
m6-deck16_engineering
m6-deck1_bridge_redalert
m6-exterior
//Mission 7 Attrexian Colony 1
m7l1a-attrexian_colony
m7l1b-attrexian_colony
m7l2a-attrexian_colony
m7l2b-attrexian_colony
m7l2c-attrexian_colony
//Mission 8 Idryll Ruins 2
m8l1a-drull_ruins2
m8l1b-drull_ruins2
m8l2a-drull_ruins2
m8l2b-drull_ruins2
//Mission 9 Klingon Starbase
m9l1a-klingon_base
m9l1b-klingon_base
m9l2-klingon_base
//Mission 10 Romulan Installation
m10l1-romulan_installation
m10l2a-romulan_installation
m10l2b-romulan_installation
//Mission 11 Idryll Ruins3
m11l1a-drull_ruins3
m11l2a-drull_ruins3
m11l3a-drull_ruins3_boss
m11l3b-drull_ruins3_boss
//Mission 12
m12-end

//COOP MOD ONLY
//COOP MOD ONLY
//COOP MOD ONLY
//A Gate two Birds and the beautiful Sky Mod
coop_gbs1
coop_gbs2
coop_gbs3
coop_gbs4
coop_gbs5
coop_gbs6
coop_gbs7
coop_gbs8
coop_gbs9
coop_gbs10
coop_gbsCredits

//Return of the Empty Crown
coop_rotec1
coop_rotec2
coop_rotec3
coop_rotec4
coop_rotec5
coop_rotec6
coop_rotec7
coop_rotec8

//The Aftermath Episodes
coop_aftermath1
coop_aftermath2
coop_aftermath3
coop_aftermath4
coop_aftermath5

//Custom Coop Maps
coop_alien
coop_blArena
coop_bugs
coop_hatoriaOutpost
coop_iceStation
coop_paradiseIsland
coop_paradiseIsland2
coop_rescueChell
coop_equinox
coop_coreAttack
coop_ente

//Example maps
coop_noscript_example
prf_multioptions
prf_*

Thank you for your reply.
I tried as you suggested and that fixed the problem. I can now run the game ok.