Running DF Pro 9.9 on Windows 10. 2 Nvidia Quadro cards - P620 and P400, 6 monitors.
When I change monitor profile using a hotkey, occasionally Windows will lock up, requiring me to do a hard reset (pressing physical reset button on PC). The lock up happens immediately after pressing hotkey to change monitor profile. This has happened twice in the last 2 days.

Wondering if you guys have seen this before and if you have any ideas on troubleshooting.

Screenshots from Windows Reliability Monitor:

I updated to the beta, and it's been working great. No freezes when changing monitor profile since updating to the beta.

I was on v10 beta for ~6 weeks and didn't have this issue once. I updated to v10 this past Sunday and this morning, after waking the PC, I pressed the hotkey to change monitor profile and PC instantly locked up - same issue that started this thread.
Please can you provide a link so I can go back to v10 beta?

File attached.
Thanks for link. I'll post back if the beta is running without issue. And if you see any possible culprits in the troubleshooting file, please let me know, thanks.

If I install the beta over the existing v10 installation, will my monitor profiles be preserved?

Beta 27 was a disaster for me. Installed it Sunday (yesterday), restarted PC, put PC to sleep. Woke PC Monday (this morning), hit shortcut key to switch monitor profile and PC locked up. This evening, after switching from 6-monitor profiles to my 2-monitor profile, I tried hotkey switch to my 6-monitor profile and another lockup.

These lockups both with v10 and with v9 occur (sometimes) when I switch to a more numerous monitor profile, which for me is typically switching from 2-monitor profile to 6-monitor profile.
I just installed the earlier beta that ran for ~6 weeks without a lockup, v10.0 Beta 21

Yes.
So it seems something between beta 21 and beta 27 changed that is affecting my setup. I have 4 x QHD monitors and 2 x 4k monitors, and several monitor profiles, though I most often switch between a 2-monitor profile and 6-monitor profile.

Sure. I'll install Beta 23 this weekend and let you know how it goes, thanks.

I installed v10 Beta 23 on 4/30 Sunday. So far so good, though I notice beta 23 takes longer than beta 21 to switch from my 2-monitor profile to my 6-monitor profile, and while switching, some windows get moved to the monitors that are coming online before reverting back to their original location. But no lockup yet, so that's good.

This morning 5/4 Thursday, v10 Beta 23 locked up the PC when I tried to switch from my 2-monitor profile to my 6-monitor profile. So I moved back down to Beta 21.
If you have a Beta 22, I can try that to maybe help narrow down where things changed, causing this instability.

Installed beta 22 on May 7, and it's been working great so far.

So maybe a change between betas 22 and 23 as it relates to monitor profiles or profile switching?

I've been on Beta 22 for 2 weeks now, and it's been great - not even one lockup when switching profiles. Clearly something changed between betas 22 and 23.


Are you referring to v10.1, Beta 3?

Installed v10 Beta 23 yesterday and had a hang today (clearly a big difference from Beta 22). After restarting PC, I see 4 DF processes, and I captured dump files for all. The DF process and DF Service process both have dump files larger than 50MB, which is the max file size I can upload via this forum. Suggestions on how to proceed?

Conditions to create a hang; I think these are necessary, but not sufficient, meaning these conditions don't guarantee a hang, but make it much more likely:

1. As noted earlier, hangs usually seem to happen when switching from 2-mon to 6-mon profile. Don't think it's ever happened in reverse. It may be possible to induce hang going from 1-mon or 4-mon profile to 6-mon, but I rarely do that, as 2 and 6 mon profiles are by far the ones I use and switch between the most.

2. Hang usually seems to happen under the following sequence: put PC to sleep while in 2-mon profile, wake PC up, then switch to 6-mon profile. If it doesn't hang at this point, then I can switch back to 2-mon, then back to 6-mon and it does not hang.

I will now install v10.1, Beta 3.

Here's a link to the main DF dump file: https://drive.google.com/file/d/1D3rzimtuLJKVtVHaFmaDyJRGaU8gHh77/view?usp=sharing