Thanks for the report.  It might be that when we save the last DevTools window position, we aren't taking scaling factor into account.

I have been experiencing this issue as well, for many months. After opening dev tools for the 3rd or 4th time in a day (and every 3rd or 4th time after that) the window opens with the title bar north of the top of my monitor. It is highly frustrating to have to hover over the task bar icon, find the offending dev tools window, right click, select Move, yada, yada, yada -- 4 or 5 times a day. The window should just open in the same place every single time.

Monitor 1 scaling: 175% (Chrome lives here)
Monitor 2 scaling: 100% (dev tools usually lives here)
Monitor 3 scaling: 100%
Chrome version: 63.0.3239.132 (Official Build) (64-bit)

This started happening to me on my Windows 10 machine following this morning's Windows update. Chrome may have updated, too, I didn't look out for that after the reboot.
Monitor 1: 125% (recommended) 1920x1080 (laptop display)
Monitor 2: 100% (Recommended) 1680x1050 (primary display)
Monitor 3: 100% (Recommended) 1680x1050 (Chrome runs here)

Monitor 1 sits below and between the others.
The dev tools window (and also the standalone Google Keep app - if that helps to know) both open beyond the top left of Monitor 2. I normally have them on Monitor 2.

Chrome Version: 66.0.3359.181 (Official Build) (64-bit).

I adjusted Monitor 1 to 100%, closed Keep and then Google Keep started entirely on screen (2) where I last closed it.
I then started the Chrome dev tools and it started at the top, but off-left of #2. I moved it on screen, closed it and re-opened it. It started entirely on-screen (2) where I left it.

I changed Monitor 1 back to 125% and the problem returned for both Dev tools and Keep - although the dev tools windows was not as large as when originally problematic.

If it starts to annoy me, I'll leave Monitor 1 permanently on 100% - I only use it to keep desktop icons visible whilst my ~42 other programs are running!

Hi all,

Had this issue today on Version 68.0.3440.106 (Official Build) (64-bit)

To get the dev tools screen to re-display, I used someone's suggestion of "shift + right clicking the window in the task bar and then selecting move and moving back to on screen" - which worked.  Primary monitor (Surface Pro 4) at 200%, while 2nd monitor (LCD portable via USB) at 100%

I can confirm that this happens with any chrome windows launched from within chrome - not just dev tools.  Only when scaling is mismatched.  In my case I have mismatched monitors as follows:
Top left - 2560x1440 125% scaling
Top right - 1920x1080 100% scaling
Bottom left and right - 3840x2160 150% scaling

Version - 68.0.3440.106 (Official Build) (64-bit)

Very annoying as many of my workflows launch new windows in the browser, and they gradually migrate off screen.

Had this issue as well. 
Monitor 1 scaling: 100% (chrome is normally here)
Monitor 2 scaling: 125%
Monitor 3 scaling: 100% (debugger is normally here)

Side effect of this issue, is that, my default fix for this type of issue, using the windows window snapping issue, did not work. After I changed the 125% scaled monitor back to 100%. After I changed them all to the same scaling, I was then able to use window snapping to move the debugger back onto screen. 

Still happening with Chrome Version 71.0.3578.98 (Official Build) (64-bit) on Windows 10