I am having trouble using Mouse5 and Mouse5 in Isboxer.

Within Isboxer, I created a new key map for Mouse4/5. It recognizes the key just fine.

When I press it, it seems to work - but very inconsistently.
Currently, I have it tied to instant ghost wolf - so when I press Mouse4 all 5x Shamans should ghost wolf.

Sometimes this will work fine, other times, only the active window will work. Other times the active window and a random slave will do it.

When I turn on broadcasting to all, it works just fine and it works individually in each window.

So any idea what is wrong? It seems to work - just not consistently. It is almost as if Isboxer is inconsistently broadcasting Mouse4/5.