[Flesh88]

Not sure what's happening but for some reason Mapster32 will randomly freeze my whole pc.

[Forge]

attach your mapster log so people have a place to start looking

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If you're running windows 10, open task manager, choose Options at the top, and toggle 'Always on top' [on]
Mapster has frozen 3 times for me always when switching into 3D view and prevented alt-tabbing from working properly and would not bring up the task list without the above enabled. All 3 times had been right after messing with slopes on a surface where the firstwall to the opposing wall is very short.
You can confirm if it is/isn't a freeze by having audio running the background

For the error itself my impression is it is DirectX related~
Games that replace the desktop stop working thereafter until restarting the computer.
Games that are "pseudo" like Unity or RPGMaker 2/3 of the crashes do not work.
Video playback, browsers, and general programs using OpenGL work.

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I found the problem is with Windows interrupting the graphics driver without stopping it. This "freezes" the screen by drawing no more frames.
If you look in event viewer in the errors you might be able to find bugchecks that are DPC WATCHDOG violations even though you've never had a bluescreen. If they are there you can use BlueScreenView to find the log for that error and it will have the driver or service that caused the problem. In this case it should be your graphics driver. Even though the freeze has happened quite a bit there was only 1 bugcheck on mine.

The watchdog bullshit is caused by missing files for the driver and can be fixed by reinstalling or updating the driver. I recommend getting a .exe from your video card's manufacturer directly instead of using windows update. If you don't know the video card disconnect from your network [so windows won't grab a driver when you->], go to Device Manager (type in start), click Display Adapter or Graphics Display something similar, and you'll find Intel AMD Nvidia etc.