Map Flickering / Unusable

The roll20 map is flickering like a thousand times a second, causing the mouse to lag etc. and rendering the site unusable. Any idea what could be causing that? I am using Chrome version 108.0.5359.94 on Linux. I tried clearing the Chrome cache, uninstalling & reinstalling Chrome, rebooting, changing maps, creating a new game, logging in as player instead of GM, no joy. Last time I logged in was two weeks ago and it was working fine then.

I can't duplicate this behavior (currently on openSuse Tumbleweed) in Chrome.  On the other hand, I primarily use Firefox, so the only thing I use Chrome for is an occasional test like this, so I have no addons/tweaks of the Chrome browser at all.  There have been updates to Chrome over the last 2 weeks, have you verified that hardware acceleration is still on?  Since there are some addons that can alter hardware acceleration behavior in the background, have you tried in a private/incognito window?  Does it work in Firefox?  If it does, then you know it is something specific to Chrome (setting, addon conflict, ect.).

Thanks for taking a look. After I posted that message I switched to Owlbear Rodeo to run my game, after that I tested roll20 again - the problem had gone away, with no further changes  on my side - so I suspect that the resolution was a hot fix to the roll20 production environment.  I suspect that you didn't see the error either because it had already been fixed by the time you checked or because your setup differs from mine.  I have never gotten roll20 to work under Firefox.  Thanks again.

I still have that flickering problem. No joy on Chrome, but it's fine in FireFox (Ubuntu 22.04)

Many thanks for comparing notes.  I was perplexed by your info, I couldn't think of a good explanation as to why the flickering would stop for me and continue for you.  So just now I checked it again and... the flickering is back!  So my best guess now is that it is caused by a combination of two factors: 1) a subset of users are susceptible 2) roll20 are making changes to their production environment which turn the problem on and off. This is the latest in a series of problems that I have experienced recently regarding fog of war, uploading assets, changes to the UI.  The production environment seems to be growing more and more unstable lately, and at the moment I am paying for an unusable platform, I need to start looking at alternatives.

It's not a commonly-reported issue, so I have a feeling that there is something interfering with your local ability to display without flickering (I can't repeat it either, on two very different machines). For those of you with this issue, does it continue in a private browsing window? Also, even if they aren't officially supported, it might be worth trying an unofficial browser: Edge, Opera, Safari, etc. Many people use these because if they work, they work.

Got the same issue too, using Chrome on Linux

Thanks for comparing notes!  It seems almost certain that one of the recent flurry of hot "fixes" has broken the linux build.

I've the same problem too on chrome for Ubuntu! Few weeks ago everything worked fine, since two weeks ago map is flickering and unusable

Same happening here. Also Chrome and Linux (Ubuntu).

Hey folks,  We're looking into this and appreciate the info here—it looks like it's an issue Chrome-side with more recent releases that we'll follow up with them about. Vulkan drivers appear to be causing this issue, which you can disable in Chrome (chrome://flags/). Otherwise, I'd recommend the use of Firefox until resolved. Apologies for the disruption to your games!

Disabling Vulcan fixed the issue, thanks!

Thanks Ashton - I'm also having this on Chrome + Linux (intel gpu fwiw), will disable vulkan for the time being.