image breaks up horizontally when window is scrolled



9 years ago
9 years ago


(Reporter: Rez, Unassigned)


SeaMonkey 1.1 Branch
Windows 98

Firefox Tracking Flags

(Not tracked)




(2 attachments)



9 years ago
User-Agent:       Mozilla/5.0 (Windows; U; Win98; en-US; rv: Gecko/20080313 SeaMonkey/1.1.9
Build Identifier: Mozilla/5.0 (Windows; U; Win98; en-US; rv: Gecko/20080313 SeaMonkey/1.1.9

Some images break up into horizontal lines when page is scrolled vertically. The  slower it's scrolled, the more it breaks up. 

Sometimes an image display can be normalized temporarily by scrolling it up and down a few times. It can usually be temporarily normalized by maximizing another window to cover SM, then bringing SM back to the front, or by minimizing then restoring the SM window.

This is mainly annoying, and normally doesn't cause loss of function, but when it affects a small menu button or imagemap, that button or imagemap may not work correctly while it is not being displayed correctly, and I may have to do one of the various temporary fixes above to get it to function. (Encountered that at my bank's site, which I can't provide a screenie of for obvious security reasons.)

This has happened with every version of Mozilla and Seamonkey. (Does not happen with Netscape 3.x thru 4.x.) What pages are affected seems to be random, and it does not always affect a given page. Size of image or page doesn't seem to be important, but HTML/scripting structure around it might be. The example page is rather simple as they go. Once a page has exhibited this behaviour, it usually reproduces for that session, but not always. 

Not affected by clearing cache/reloading page. A later visit to the same page may be unaffected, implying it's some sort of memory corruption issue. 

What other software is running, speed of connection, or speed of hardware doesn't seem to have any influence (I've also seen this on another much slower machine before it was retired, with a very old version of Mozilla, so it's been around a while).

System: P3/550MHz, 1GB RAM, i440BX chipset, Matrox G200 AGP video card. System normally exhibits no odd issues and is very stable. Vid driver does NOT have any weird display issues. (Current hardware/OS configuration has been in use for over 10 years, so I think by now I know its quirks :)

Reproducible: Sometimes

Steps to Reproduce:
1. Go to web page
2. Scroll down to view lower parts of page
3. Observe images randomly breaking up!
Actual Results:  
Image(s) broken into horizontal lines

Expected Results:  
Images displayed complete and correct

No special themes used, only Prefbar installed as an add-on.

Comment 1

9 years ago
Created attachment 367522 [details]
screenshot, after normal vertical scrolling

Comment 2

9 years ago
Created attachment 367523 [details]
image breakup much worse when window is scrolled very slowly!

Comment 3

9 years ago
Can you try and reproduce with SeaMonkey 1.1.14?

Can you reproduce in a second profile (see ?


9 years ago
Version: unspecified → SeaMonkey 1.1 Branch

Comment 4

9 years ago
> Matrox G200 AGP video card. System
> normally exhibits no odd issues and is very stable. Vid driver does NOT have
> any weird display issues.

Normally these sort of problems /are/ caused by strange interactions with display drivers. Could you try:
1. turning off hardware acceleration (does this card have any?).
2. installing a newer/newest driver.
3. try a different video card/driver combination.

Comment 5

9 years ago
Moz/SM is the only app that has this problem on this machine, and I have about a dozen browsers installed (from ancient to modern) and a dozen image editing apps. 

I can reproduce the problem exactly in Moz v1.8 (image breaks up in exactly the same way), and similarly in K-Meleon 0.9 (which is based on Moz 1.75, I think). K-Meleon initially doesn't break up the image as much, but after scrolling up and down several times, it gets much worse than in Moz/SM.

I *cannot* reproduce it in IE 5.0, in Netscape v4.5 (don't have a more recent version of either) nor in OffByOne v3.4x.

Matrox G200 is pretty old (1997ish), I don't think it has any modern hardware acceleration. It is VESA 2.0 compliant. I have several of this video card family and have noted that the drivers are much LESS likely to have weird interactions than most (that's why I like them! :)  I don't presently have another Windows machine that has a different vidcard in it, or I would try that, but Moz v1.0 on my old P233/Win95 box, which had an S3 vidcard (VESA 1.2, and chip/driver totally unrelated to Matrox) also had the same problem on some sites. So I don't think the vid system is it. :)

Comment 6

9 years ago
Well I'd normally ask you to try the latest SeaMonkey 2.0b1pre (Gecko 1.9.1) nightly build. Unfortunately it doesn't run on Windows 98 (unless you've done something esoteric like installing KernelEx to allow Win98 to support WinXP APIs).

Comment 7

9 years ago
Also the SeaMonkey 1.1 (Gecko 1.8.1) branch is in maintenance mode and only security and stability fixes are accepted. So unfortunately this is a WONTFIX unless you can reproduce the problem with SeaMonkey 2.0b1pre or Firefox 3.1b3.
Last Resolved: 9 years ago
Resolution: --- → WONTFIX
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