This is my second attempt at SMBC, made with the following recipe that is supposedly from Collette Peters's book "Cakes to Dream On". I got the recipe from the internet, so I'm trusting that it was correct.
I halved the recipe and used:
3/4 cup egg whites (fresh)
1.5 cups granulated sugar
3/4 pound butter
1 Tbl. vanilla
I heated the egg whites and sugar over a double boiler while whisking, until the temp. was 140 deg.F, then I moved the bowl to a stand mixer and mixed on the highest setting until stiff peaks formed and the mixture is cool. But when I start to add the butter (1 Tablespoon at a time), the whole thing starts getting really loose. It never breaks, but gets the consistency of pudding. Too thin to spread. It's in the fridge now cooling so hopefully it'll stiffen up, but my question is... is my cheap-o mixer one of the reasons it turns out like this? Would having a KA help? I didn't think it was the heat, because the meringue wasn't really warm when I started adding the butter. 
Help please! It tastes so good, but it's really runnY!
Okay... so I'm an idiot. I teach high school math, so you'd think I could do this better. I could just scream at the mistake I made. I halved the recipe, but did not halve the butter amount correctly. The orignal called for 3lbs, so I should have added 1.5 lbs butter instead of the 3/4 lb. So it's 9 pm now and I've got three sticks of butter on the counter waiting to soften and be added to my frosting soup! I need these cakes tomorrow for a club party at school!
Hope it all comes together for you well once you get that additional butter in... we've all done it 
You don't have to wait it out on the butter though, just pop em in the microwave!
Also be careful that you don't get the icing too cool.... it can break that way (the you can fix it by heating some and rebeating)
So it all ended up coming together nicely. I'm happy it turned out, but I had problems getting it to take the coloring. Might have to try Americolors with that kind of icing. Everyone raved about how light the frosting tasted!
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