Some marco issues i was discussing with an LS mate that folks seem to have alot:

When typing the name of the item, Always capitalize the first letter. Example

/equip head "Serpent Sargeant's Coif"
If it has a color Capitalize the Color withing the brackets. Example
/equip head "Beret Of Tom Foolery (Black)"

Ear, wrist despite being a single item, are plurals:

/equip ears
/equip wrists

For ring slots. capitalize the R or L add a period and then finger with no spaces. Example

/equip R.finger
/equip L.finger

If your equipping job specific items makesure to have /job added after weapon change. I personally add a wait for 2 seconds for the job stone equip and animation not bork the rest of my macro. Example

/equip mh "Spear Of Crazy Killemall"
/job
/wait 2
/equip.....ect

Also because of how the UI menus work currently. I recommend when making a gear macro, remove everything, equip each piece you want in a quiet place (your Inn room works well) so you can have easy reference of spelling etc so you won't be getting pissed it doesnt work becuase your E is an A ^^

Also a neat trick i discovered accidentally. If you write an equip macro with just the 2 quotes and nothing between them, it de-equips whatever is there. (havent tried it specificlly, but it rips my neck off every time in my one macro.

/equip neck ""

If you make a full macro for slots it could be a quick way to trip off gear for whatever reason you may need to do so ^^

Those are the usual macro killing culprits. The only one that seems to give me trouble now is off hand and sheidls. not sure why it sometimes refuses to work but i probably messed it up somehow ^^