This is a known issue that has been fixed by hotfix patch 1.4.0f10.

Hrm. I can't replicate this in the internal version - in my case, augrum walls bordering fully frozen glacial doors turn into permafrost as intended.

Intelligent minions that dine in the tavern will actually pay for their meals (around 300 gold per visit), and drop their payment on the ground. Your workers normally should pick up the gold and carry it to your dungeon core or vaults, but it's very low and their priority list and they will only scoop up the gold if they have nothing better to do.

I think this is related to the fact that roasting prisoners now adds 60 or so meals meals to the tavern, and the roast won't accept more meals than it can storage.

Very minor however, imho.

Can replicate. It's nothing game-breaking because the beast minions can not attack (and thus gain EXP) from the spirit, but it's still mildly confusing.

It appears that the "barracks too small" alert will also play if one of your minions can not reach the barracks, i.e., when minions are locked in a room.

The fact that you actually can claim the portal to the east is a developer oversight - it is meant to be indestructable and unclaimable by your forces. That being said, the sapper dwarves should only spawn between the actual waves, yet from my understanding, they still were spawned after all three attack waves had been repelled - is that correct?

Looking at your system specifications, it seems that you only have 4gb of RAM. While this does meet the minimal system requirements, it can cause slowdowns in some of the busier levels like campaign mission 10. WftO can not, however, simply shut down your system by itself, so it indeed is very likely a hardware failure.

If you checked your PC's temperature, which components in particular did you check? The PC simply shutting down without a further whimper sounds as if the CPU is overheating (especially seeing how it only does so after a while), but if the CPU temperature is within acceptable parameters, this naturally isn't very likely to be the issue. You should, however, check whether or not your PC's power supply unit may be overheating, which may happen if the GPU gets especially power-hungry for graphics-intensive games.

There's a lot of other potential causes for this issue, including outdated or malfunctioning drivers, hard drive failure, and whatnot. Sadly, given that WftO very likely is not the cause of the issue but simply triggers the symptoms, I'm unsure whether there's very much we can do to help you. At best, I would recommend to do a bit of testing with benchmark software, so as to see whether or not the shutdown is related to heavy resource usage, or whether it is a mechanical problem.

I actually tried to replicate this on the internal build, but the issue does not occur for me here.

Interestingly, there actually seem to be two "first waves" - the first one (two sappers, one templar) when the mentor urges you to use the Quickfreeze potion on them, and a second one (two sappers, one templar) after the Crackpot is introduced.

Can confirm. I think this happens when multiple workers pick up KO'd enemies but the prison only has space for, say, two more prisoners, while the workers carry four of them at once towards the prison.