Does anyone else have technical issues with this game? Just curious. What I've encountered so far with my GOG copy of the game:

a) Poor performance and consistent crashes when I've cleared a stage and lots of loot is on the ground. Workaround: turning the graphics settings all the way down.

b) Sometimes critical mission clues not spawning. I had to replay a mission 5 times because after hours upon hours of scanning every nook and cranny, the clues where nowhere to be found. The 5th time they immediately appeared when I entered a room.

c) Worst of all -- random game overs. I played Berger's Factory mission (the first half) 3 times. The obejective was to not kill any citizens. No citizens were killed by me or the enemy. No one was even injured in the slightest. Didn't use explosives, didn't shoot recklessly. I was constantly checking everyone's health. No other objectives to fail.

What I ended up doing was buying a Steam copy. That solved all 3 issues. This is the first time for me that an old game works better on Steam than on GOG. The only drawbacks I've seen so far is no VSYNC (which I can enable through my GPU's control panel anyway) and the shadows are missing.

Can not say anything yet :/
I have only played the tutorial / entry mission.
I'll let you know when I'm further in the game :)

Some missions have a problem where the clue can get stuck in the building but you can blow it up to reveal them.

As for the factory it depends what you mean. If you kill a civilian it should instantly fail you. To get to the 2nd part you need to take everyone to the gate in the lower level to start it.

Honestly, never had such a problem with the Steam version. The clues always showed up once you were close to them, didn't have to randomly blow up parts of buildings.

About the factory now, yes, I know you have to go to the basement to fight a few PKs, gather your troop and move on to the next phase (another underground level with more PKs).

I actually finished the 1st game on Steam and now I'm trying out GOG's version of Sentinels. Haven't played many missions yet, but so far I don't have the issues I had with the first game. If it goes tits up again at least I can fall back to the Steam version.