The Ocelot can send just one X-10 command and not the pair. This is handy if you want to turn a group of lights on or off at once. Look at the attached screen shot below and you will see when I receive a G, All Lights On, I can turn on an A housecode group of lights on at once, same for the C & D group (actually I'm dimming C13).
The command pair means both commands (the house code/unit code AND the house code/action) or this "pair" of commands is sent at once.
So for your A2 OFF command you want to receive, it will be: (say in this example you want to turn on a lamp which is C2 (do an X-10 Quick ON/OFF)
IF X-10 House A / Unit 2, ON Command Pair
THEN X-10 House C / Unit 2, Turn ON
Remember that you can go to system map and name those house codes something more understandable like Bedroom_Lamp.
As far as not seeing those X-10 signals, I agree with JR, will that PSC05's outlet work with anything else X-10 (I assume you can see the command via Homeseer's log so it isn't a problem with an X-10 palm pad remote or whatever is generating the Command.
BTW, how exactly are you generating the command, via a maxi/mini controller or Palm Pad (you know that would require Homeseer to be running also so the MR26A is working properly??