Possibly related: https://bugs.chromium.org/p/chromium/issues/detail?id=597228

I haven't reproduced this problem on my nvidia Quadro K620 after updating the driver from the gWindows-default NVidia v19 driver (circa 9/2014) to the v21 driver (circa 8/30/2016). 

My current theory is that something changed between M54 and M55 in terms of how CSS masks get rendered and the change that tickles a bug in the outdated driver.

Changing tags, I do not believe this is a devtools bug. I have tested on a few different setups without success. I am thinking elawrence@ is correct in their assessment.

Possibly a Skia change in 55 that's tickling this driver bug?

It would be great if the devtools team could create a reduced test case (my kung-fu is not "inception" enough to inspect the inspector, apparently). Are there really CSS filters here, or only CSS masks? Can devtools trigger GPU rasterization?

To use the Inspector on the Developer Tools, undock the tools into their own window (using the UI at the top right) and then hit CTRL+SHIFT+I to inspect the tools. The affected UI is using a mask image against a colored background (presumably to allow changing of the background color in high-contrast, etc, without requiring a different image be used):

    -webkit-mask-position: 0px 0px;
    background-color: #0B8043;
    -webkit-mask-image: url(Images/securityIcons.png);
    -webkit-mask-size: 80px 32px;

OK, thanks! Looks like this issue is unrelated to CSS filters, then.

I tried to repro on Windows 10 with 54.0.2840.71 (Official Build) m (64-bit) and 56.0.2899.0 (Official Build) canary (64-bit), and I can't see the corruption.

I have a Quadro K2200, with driver version 361.91

I wasn't able to repro this on mac either. If #4 is correct, then this isn't really a CSS bug, so removing the Blink > CSS tag.

Sounds like this is fixed, then.  Please reopen if you see it again.