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The main window scrollbar is unpredicatably missing on many StackExchange sites.

enter image description here

Here is a screenshot of a set of search results with no scrollbar.

The scrollbar can be recovered by reloading the page, or (for example) opening the "Recent inbox messages" dropdown. Sometimes the scrollbar is shown, other times it is not, on the same page. I've noticed this for about a week.

It seems while loading the page, the scroll bar is drawn, but then removed once the page has fully loaded. This is chrome Version 94.0.4606.81 (Official Build) (64-bit) On Gnome 3.38.5 (Unbuntu 21.04)

enter image description here

For comparison here is the same page after a reload with the scrollbar visible on the right.

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  • Can you provide steps to reproduce, or does it seem random?
    – bobble
    Commented Oct 14, 2021 at 18:40
  • It seems random, it can occur on multiple sites across the network,and on various pages such as "Home" and "Questions" and (as above) "Search results". A reload will usually fix the problem, but it happens often enough to be frustrating.
    – James K
    Commented Oct 14, 2021 at 18:49
  • When that happens, can you still scroll down or is the page not fully rendered?
    – 41686d6564
    Commented Oct 14, 2021 at 19:10
  • The page is fully rendered. And you can scroll down with cursor keys.
    – James K
    Commented Oct 14, 2021 at 19:13
  • Most likely something local, on your side, cause this. Try to disable all userscripts, including ad blockers, as they change the page contents in unknown ways thus many times cause exactly such notorious bugs. Also more than once I heard about external security software (e.g. anti virus) which hooks into browsers and doing the same: mess with the contents to "protect" against possible threats, so try to (temporarily!) disable those too. Hopefully this way you'll find what's causing it and can share with others here.
    – Shadow Wizard
    Commented Oct 15, 2021 at 5:42
  • 1
    Also, BTW - there is picture of you in the screenshots (probably?) You might consider posting new screenshots, without it?
    – Shadow Wizard
    Commented Oct 15, 2021 at 5:44
  • It does seem to have been a browser extension, as turning them all off and I can't reproduce this. So I'll try to divide and conquer to find which one.
    – James K
    Commented Oct 16, 2021 at 0:01
  • I got this myself and tried to investigate it with the browser console, but inspecting made a scrollbar appear, even after I dismissed the inspection window.
    – bobble
    Commented Jan 21, 2022 at 22:08

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