You can't use that command right now...

[Jimjam]

You put the /pause in front of the command,
Not after.

/pause 1, /attack of
/pause 1, /do 7 (backstab in the first of the four button of combat tab)
/pause 1, /do 1 (pickpocket in the first of the six button of abilities tab)
/attack on

Try this, increase the pauses if needs be.

There is sometimes a delay toggling attack which is why input that at start and end.

It sounds like you have a ui / lag / sync issue

Try creating a level 1 halfling rogue with default UI and make an evade macro. Do you have the same issue?