KM 8.2.4 on macOS 10.13.6 here. For some reason, your test macro wouldn't find the image either in the main screen or front window for me, but once I replaced it with an identical one screenshotted on my own system (this one, for what it's worth:
both actions succeeded for me just fine in both Safari 12.0 and the official 64-bit build of Chrome 69.0.3497.100.
You don't specify which browser you're running here, but in this thread (Found Images suddenly broken) you said it occurred while running Chrome 69.0.3497.100 (3497.100); did you also try it with Safari? If it is only in Chrome, it's almost certainly a problem with Chrome no longer reporting window (and tab) indexes or IDs correctly as of the most recent versions, and not with KM. @ccstone and I discussed this a bit here, and it seems that even though Chrome is at least reporting window indexes correctly in the official build as of 69.0.3497.100, it still doesn't resolve the issues with KM actions that involve looking for the front window, at least on macOS Sierra.
Yes, I was/am using Google Chrome 69.0.3497.100 (3497.100) on macOS 10.12.6.
When I test using Safari 12.0 (12606.2.11), then the KM Found Image works.
It is very interesting that it works for you in Chrome when you are running High Sierra. This will be the first case I know of where High Sierra is better than Sierra.
@peternlewis, any thoughts on how we might be able to workaround this when running Sierra?
Also of note, it does not work when trying to match the window title:
Running Google Chrome 69.0.3497.100 (3497.100) on macOS 10.12.6.
See:
Here's my revised macro:
MACRO: TEST KM Image Found
#### DOWNLOAD:
<a class="attachment" href="/uploads/default/original/3X/c/1/c1ab0567db7f3643344d1e142d8589adc0bc5783.kmmacros">TEST KM Image Found.kmmacros</a> (25 KB)
**Note: This Macro was uploaded in a DISABLED state. You must enable before it can be triggered.**
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![image|463x931](upload://6kp0Zxzsy4sQm0RUATj9ShSuFbE.jpeg)
This should be worked around for the next version of Keyboard Maestro (or resolved anytime the lunatics who caused Google Chrome to add “ - Google Chrome” to the end of every window’s accessibility title revert their ridiculous change).