Just upgraded to 8; lots of Macros breaking, especially anything with Found Images, Flow Control using Pause and app Conditions Met.
Growl used to display messages at a size and delay I could read, plus kept a detailed log file; now macOS Notifications disappear too quickly, and are so small and badly truncated I can’t discern the issue even when looking in the Notifications History pane.
Since Sierra Console is (also) a disaster for old people, I created a macro in KM to show the error log in Terminal, where you can set the text and font size to your liking; you can make your own using the following command:
tail -f ~/Library/Logs/Keyboard\ Maestro/Engine.log
For those of us still desperately hanging on to useful tools like Growl and GeekTool, you can also use GeekTool to display the same log file on the Desktop or in a floating window, easily toggled on and off with KM and AppleScript.
Personally, I would like to see KM add it’s own Error Log window/console (if it exists already, I’ve never found it), as opposed to just exposing the log files in Finder.