Aye,
I'm having the same issues with "/click left enviro combine" and family. Yes, I've tried all the resolution kludges and bag pop-up real estate management. No workie. It essentially just bails and gives me the default standard error output for the syntax of "/click".
Heh, so what did I do? I ghetto'd it with straight up X,Y coordinates for "/mouseto" and used that and "/click left" after moving the mouse. Pretty ghetto eh?
Ahem, but yes... it does appear to be broken unfortunately. That along with /who, which spuriously reports who is in the zone instead of a plenary listing of who actually is in the zone.
If the good developer folks could provide more insight here and perhaps generously fix that particular nasty bug ( assuming it is one ) that'd be pretty awesome. Until then, I'm hoestrollin it with /mouseto and a simple non-enviro "/click left".
.z