User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1pre) Gecko/20090521 Shiretoko/3.5b5pre Firefox/3.0.10 (.NET CLR 3.5.30729) Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1pre) Gecko/20090521 Shiretoko/3.5b5pre (.NET CLR 3.5.30729) Running Windows 7 Build 7127. When bringing up a menu, such as a context menu, it is briefly displayed improperly. I've seen them being delayed a bit, being all black for a second, painted on the screen, etc. Once displayed it is correct unless I open a sub menu which might give me the same problems. This behavior is not limited to context menus but other menus as well. It is very consistent but there are times when everything is fine. This is especially true if I open up the same menu a second or subsequent time. Tried different video drivers to no avail. Tried safemode and a new Profile. Also to no avail. Works fine under Vista on my same computer. Reproducible: Always Steps to Reproduce: 1.open up a context menu 2. 3. Actual Results: anomalies when menu first begins to display Expected Results: Properly initialized menus.

Using a Sapphire 3850HD with 9.5 CAT video drivers.

I've seen this too but thought it were the video card drivers. They were recently automatically updated but the problem was still not repaired.

Gary, do you see the same with Firefox 3.0.10? If not this is a regression and we should narrow down the regression range.

I'm not running 3.0.10. It's only on my UA for compatibility. Where is the zip version located?

Grab one of the latest nightlies from here: http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/2009/05/2009-05-21-06-mozilla1.9.0/

Strange. Firefox 3.5b4 works fine for me on 7100...

Tested out the 3.0.12 nightly and it exhibited the same behavior but a lot less. I think part of my problem was that my sub-menu delay was set to zero in 3.5 while 3.0.12 took the default. I reset my value in 3.5 and took the default. Now 3.5behaves more like 3.0.12 but both on occasion still produce a black menu for a split second. Not always mind you.

I discovered another program that behaves the same way. It's called WinMount. It's menus behave like 3.5's. Since all other apps I tried so far are fine perhaps there is something in Windows 7 (possibly 7127) that causes this with certain apps depending on how they use display services.

I think it could be related to video drivers (even though you tried a lot). E.g. for me, the Taskbar sometimes starts to flicker when I browse (I think I had that with IE too). Plus, there are quite a few people complaining about this flickering in internet forums. If your videocard is intel, I suggest to check Windows Update for optional updates. I got a new driver from there just a week ago, and I think it now flickers less than before.

I have a Radeon 3850HD and have the latest drivers for Win7. However they are beta and unsupported. I tried the stock ATI drivers that came with Win7 but they behaved the same way. Guess we will wait and see.

I also have no problems in Windows 7 Build 7000 and 7127 (both x86) using Firefox 3.5b4 and the nightlies. I'm running the latest Win 7 drivers for my ATi HD4670...

Try some drop down windows on web sites. Look for a black flash on the menu for a split second. It doesn't happen all the time especially if you got the black flash already but enough to make me think there is a conflict somewhere. As I noted all my apps work fine except one. When I just spell checked a flagged word above the resulting list got the 'black flash'.

OK, I just noticed that too (build 7100, Firefox 3.5b4). It only takes a fraction of second, so I probably didn't pay attention to this before.

The longer the menu or dropdown is the more noticeable the black flashing can become. I even get it using the dropdown on the location bar. Me thinks Windows 7 and FF and maybe video drivers need to communicate better :-)

Turning Aero ('desktop composition' in Performance Options) off fixes the problem for me.

FYI Seems like all the MS programs don't have this problem which I guess makes sense as they came with 7 and probably coded for it. I did a lot of testing with IE8 and there were no problems at all. While most of my other programs don't display this 'glitch' I did find another one that does, called RJ TextEd. Perhaps some API has changed in 7?

Confirming this could be driver related. I've tried the RC on two machines, one of which has this issue (desktop with a nvidia 9600GT, don't have version at hand) and the other is working fine (laptop with nvidia 9600M GT, driver version 7.15.11.7967).

See also bug 433920 for problems with the Nvidia driver. But this issue sounds x-driver related.

I recently got a new machine which has an nvidia gtx260 in it. There are no screen anomalies at all. My previous card was an ATI HD3850 AGP. So it appears it could be the drivers.