The Forum Server will be being upgraded next, and may not work consistently for a period of time (possibly a couple hours, maybe more if things go badly).
Currently it is scheduled to be at 5:00 UTC on June 23, which should be late at night in North America and early in the morning in Europe, and a useful time for me in Australia, so hopefully a minimal disruption.
I will also reply here and on the the Keyboard Maestro twitter account when the process starts and finishes, though the forum wont necessarily be accessible. I'll put the forum in to read only mode for the duration.
Refer to the new System Status web page on my web server, which indicates the known status of various servers and systems. If you detect an issue, that is a place you can report it, and I will be promptly informed of the issue and can follow it up.