One test you're not covering is what happens when both CPU and GPU are under load - Try running Prime95 and Furmark at the same time.

You probably won't find much of use in any logs - If the PC is hard rebooting like you're suggesting then you've got some fairly serious hardware issues. WFTO does stress a number of components which often causes bad hardware to have problems. Take a look at this guide to troubleshoot further: http://www.howtogeek.com/174068/how-to-identify-which-hardware-component-is-failing-in-your-computer/

haha. Thanks for the frank reply. We'll make sure to add it to our list of things to ask future users with similar issues. :)

Looking at a linux machine here, I thought maybe your locale is still broken as the LANGUAGE env var is missing too, but I tried removing it and the game still ran no problems.

I may have to build a bebug build of the game for you next week to continue, as I don't have enough information to take next steps.

mmm. The only oddity I can see at the moment is this missing lib:

Fallback handler could not load library /mnt/games/Steam Linux/steamapps/common/War For The Overworld/WFTOGame_Data/Mono/x86_64/winmm.dllFallback handler could not load library /mnt/games/Steam Linux/steamapps/common/War For The Overworld/WFTOGame_Data/Mono/x86_64/libwinmm.dll.soFallback handler could not load library /mnt/games/Steam Linux/steamapps/common/War For The Overworld/WFTOGame_Data/Mono/x86_64/./winmm.dllFallback handler could not load library /mnt/games/Steam Linux/steamapps/common/War For The Overworld/WFTOGame_Data/Mono/x86_64/./libwinmm.dll.soFallback handler could not load library /mnt/games/Steam Linux/steamapps/common/War For The Overworld/WFTOGame_Data/Mono/x86_64/winmm.dllFallback handler could not load library /mnt/games/Steam Linux/steamapps/common/War For The Overworld/WFTOGame_Data/Mono/x86_64/winmmFallback handler could not load library /mnt/games/Steam Linux/steamapps/common/War For The Overworld/WFTOGame_Data/Mono/x86_64/libwinmm.soFallback handler could not load library /mnt/games/Steam Linux/steamapps/common/War For The Overworld/WFTOGame_Data/Mono/x86_64/./winmmFallback handler could not load library /mnt/games/Steam Linux/steamapps/common/War For The Overworld/WFTOGame_Data/Mono/x86_64/./libwinmm.soFallback handler could not load library /mnt/games/Steam Linux/steamapps/common/War For The Overworld/WFTOGame_Data/Mono/x86_64/winmmFallback handler could not load library /mnt/games/Steam Linux/steamapps/common/War For The Overworld/WFTOGame_Data/Mono/x86_64/libwinmm.dllFallback handler could not load library /mnt/games/Steam Linux/steamapps/common/War For The Overworld/WFTOGame_Data/Mono/x86_64/libwinmm.dll.soFallback handler could not load library /mnt/games/Steam Linux/steamapps/common/War For The Overworld/WFTOGame_Data/Mono/x86_64/./libwinmm.dllFallback handler could not load library /mnt/games/Steam Linux/steamapps/common/War For The Overworld/WFTOGame_Data/Mono/x86_64/./libwinmm.dll.soFallback handler could not load library /mnt/games/Steam Linux/steamapps/common/War For The Overworld/WFTOGame_Data/Mono/x86_64/libwinmm.dll

However I've never seen this nor can I find anything interesting out on the Google. I did notice you appear to have an xbox controller plugged in? This might sound odd, but could you try unplugging it prior to loading the game?

Setting this to complete as we've had no feedback from the user.

and the Steam application restarted.

What do you mean by this precisely? The game quit (no error), then Steam appeared to reload (login, etc)?