Hmmm. My macros are simple:
/cast Regrowth
or
/cast Wild Growth
I target the toons by 0-4 on the Number Pad, but it only seems to work from my druid's window. I went into the Key Bindings in WoW on all the other toons and took out any key bindings that have to do with the number pad numbers (0-9) so that they wouldn't conflict with what I'm trying to set up.

Under Target my options are:
Window:Current
Window:All w/o Current
Window:All w/ Current
Character Slot:1(name-server)
Character Slot:2(name-server)
Character Slot:3(name-server)
Character Slot:4(name-server)
Character Slot:5
Character:name-server
Character:name-server
Character:name-server
Character:name-server
Character:name-server

I had chosen Window:All w/ Current. I must be missing some other broadcast feature since it only works on my druid's keys 0-4 on the number pad since I have those bound on only his Key Bindings in WoW?