I got this "bug" too after last patch. I use Keyclone and this "bug" seems to happen with every macro I have on my slave clients. Follow macro was first that I noticed was not working.

This is avoidable if you don't minimize your wow clients to task bar, but keep them open and maximized. If I use Follow macro when I have slave clients minimized, nothing happens.. but when I maximize client window, macro executes.. like it's waiting me to look what is happening.

Something is preventing macros to be run (or waits until window is maximized) when window is minimized.

I hope this will be fixed, way or another.