Hey Folks,

Just reinstalled MW5 on steam after a few years and for a half day or so I've been encountering frequent (once per mission or between missions) "Fatal Error!" crashes and I finally seemed to have discovered some version of a fix: disabling/unplugging my second monitor. Posting here for future reference in the event others encounter issues like this.

For reference:
Windows 10
Asus Z87 Pro
i7-4790 3.60 GHz
16GB RAM
GTX 1080Ti

I did complete the following troubleshooting unsuccessfully before arriving at this fix (in no particular order). These were done one by one and did not fix the issue.
- Restarted
- Updated graphics drivers
- Tried various settings changes (including all low/off, vsync on/off, sharpening on/off, low resolutions)
- Tried all windowed settings
- Tried forcing DX12 (-D3D12)
- Monitored GPU and CPU performance/temps during gameplay (nothing noted indicating hardware failure)
- Verified integrity of game files
- Disabled, manually removed all mods
- Uninstalled, reinstalled the game (on an SSD)
- Deleted all saves
- Uninstalled, reinstalled on an HDD
- Increased TDR waits using registry keys TdrDelay and TdrDdiDelay (a common fix for UE4 crashes)
- Enabled integrated graphics for secondary monitor (via BIOS), and plugged HD secondary monitor into mobo via DVI (after discovering that the crashes stopped after unplugging the monitor form my GPU- note that using integrated graphics here didn't seem to matter- after I plugged the monitor in to the mobo- I once again continued to see the crashes).

If you're experiencing very frequent Fatal Error crashes with Mechwarrior 5 and you have multiple monitors, try unplugging a secondary monitor, it might resolve it! Again posting here for future googlers.

If anybody is aware of a method for resolving this kind of issue without actually having to unplug your second monitor whenever you want to have a MW5 sesh (or if I've overlooked a simpler fix), I'd be very interested...