This is apparently a Chrome bug. It fails to render some 32 bpp .ico files correctly. I have implemented workaround that seems to fix it and it will be available in the following update. Meanwhile, you can workaround this problem in your design by making your favicon object not perfectly pixel aligned. For example, if it has X coordinate something like 988, change it to 988.1 This should do the trick. Alternatively, make sure you have at least some not fully opaque pixels in your favicon design.

Thanks for spotting it.