GZDoom 2.1.1 multi-adapter crash on startup

[ATIRAGEPROTURBO]

Test setup:

• GZDoom 2.1.1 x64 fresh extraction to a clean folder
• dropping in unmodified doom2.wad
• running as administrator
• Windows 10 Pro x64 10586
• Core i7-4790K
• Radeon R9 290X with ASUS VG248QE (primary)
• Intel HD 4600 with two monitors connected (secondary)
• all drivers latest non-beta versions as of this posting
• no overclocking

Expected behavior: Launch gzdoom.exe and play game on primary display.

Actual behavior: GZdoom attempts to set the mode on one or both secondary monitors (both flash briefly) and then immediately crashes.

Steps to reproduce: Launch gzdoom.exe.

Troubleshooting notes: I found that if I disable the secondary displays or the primary display, the game starts up just fine. To be clear, it starts up fine in multi-monitor mode, as long as I am only using the one graphics adapter (it works fine -- at over 400 fps! -- on Intel HD 4600.)

[Graf Zahl]

If you get a crash report post this. Without it there's not much I can do as I neither have Windows 10 nor comparable hardware.

[Rachael]

Sounds almost like the ATI drivers were not installed properly, but without the info Graf is requesting it's hard to be sure.

[ATIRAGEPROTURBO]

Sounds almost like the ATI drivers were not installed properly, but without the info Graf is requesting it's hard to be sure.

Heh, nah, the drivers are fine. I have no problems running anything else.

I'm not getting an error message or anything; where would I look for any sort of error/crash log? I don't see anything that stands out in the game folder, like a .log or .txt.

[ATIRAGEPROTURBO]

Just an update on this, vid_adapter actually has no effect (game still opens on primary display, still renders on primary display adapter) besides changing the resolution of the game window to match that of the chosen monitor. I was trying to force the game to render on my IGP instead of the the discrete GPU; no dice.