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§ Weird bug of the day

Today's bizarre bug: it seems that at least on my system, if I have any top-most windows on my desktop, hitting Windows+D twice in quick succession causes the top-most flag to spread to other top level windows. Thanks to this weird behavior, I now have Visual Studio, Firefox, a Command Prompt, and WinVi32 topmost and everything else I launch is getting dumped below them.

I don't generally run desktop adornment programs, so there aren't a lot of possible culprits here... I think it's basically either Windows 7 x64 or NVIDIA nView (which should be off).

Comments

Comments posted:


Don't see it on my system. probably nView... I didn't even install it. The new NVIDIA drivers installer give you much more control over which components you want to install.

Username - 29 01 11 - 13:35


Something is seriously broken on my own Windows 7 machine w.r.t. window ordering. Alt+tab often changes the active window, and reorders the windows in the alt-tab popup, however the actual focus and z order is not affected. pressing it again twice will have the same effect.

I have yet to isolate this problem. The only 3rd party software that could seemingly cause it is VNC server, but that makes no sense.

David W - 29 01 11 - 16:44


@David:
Sorry for me being too lazy to look up the correct registry key and links, but I think you see the normal behaviour of Vista and Win7:
Raymond Chen describes in the oldnewthing that LRU-order is only used for the last 3 windows, after that they sort it alphabetically, because people's mind would not remember more than the 3 last windows. This is ridiculous of course and really reall stupid.

I turned off the new fancy alt+tab screen which I like and now have the same thing one sees if the explorer-process is killed: An ALT+TAB like in XP only with icons, not with previews.
Now I have my Z-order back.

An alternative could be that you learn alt+esc or something, maybe it preserves the z-order better

Christian - 29 01 11 - 21:15


I can reproduce the top-level Win-D problem on my Win7 laptop which has ATI graphics, so it's not NView (unless the same bug exists in two things).

I cannot reproduce it when remote desktop'd into my main Win7 machine (NVidia graphics but no NView, FWIW), so I suspect the bug is in, or triggered by, DWM (which isn't in use when I use RDP).

To repro on the laptop, I opened two windows, made one always-on-top (via an option in the app itself), hit Win-D twice, then opened a web browser and saw it was stuck behind both windows.

Leo Davidson (link) - 29 01 11 - 23:12


For what it's worth, I couldn't reproduce this.

Win 7 x64 & radeon graphics.

fmagreed2 - 30 01 11 - 02:04


Now that I'm no longer using RDP (and now using DWM), I can repro this on my desktop as well. (Both desktop and laptop are Win7 x64.)

At least right now, on the Desktop, it seems to only make on-top the window which was active when I pushed Win-D the first time. So if that window wasn't on-top but another was, both will be on-top afterwards, but the other windows are left as they were.

I suspect there's more to it than that as I don't think it was quite the same when I repro'd it before.

I've also repro'd it using two different programs as the on-top window, so it's probably not something peculiar any particular app is doing in its on-top/z-order handling.

Leo Davidson (link) - 30 01 11 - 21:11


I have the same bug, win 7 x64, Nvidia 240GT.

EO - 07 02 11 - 01:36

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