Indeed, I'm keeping SmartBuff on my other chars but am moving over to using PallyPower more for my pally, just gotta figure out how to get it to do my seals before I can stop using SmartBuff on the pally.
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The part I am interested in is where you state "It is spammable". Have you tested this? I can see situations where these macros could be very useful in a non-buff situation (like "renew" being cast on your party etc). I'd love to have a button I press 5 times and it casts renew on all 5 members of my party ... but if I spazz out and click it too fast won't then go through and rebuff some party members twice.
I have this problem too. Sometimes it says nothing to do. I open the interface, go to Party, uncheck and recheck the buffs and then they work. I have to do this on each toon. Sometimes it just works.
Also make sure you have mainhand/offhand checked if applicable. I seem to recall it getting pissy with me when I went from a staff to dagger and shield.
I also get problems if Solo and Group aren't set up the same, usually if Smartbuff tries to start buffing before my group invites finish. Made things really messy with my paladins for a bit.