Just keep whipping it. It'll come back together once all the ingredients warm up and reach the same temp. If you are in a hurry then you can heat the bowl with a torch or warm cloth. It will always seperate and look terrible when you first start re-beating it.
I hope it worked and you didn't give up on it! You really do have to let it sit out for a good long time to make sure it's truly room temp. I often use my digital thermometer just to make sure, as I know it can be so heartbreaking to see it break. Don't forget, if it goes totally soupy on you (rather than curdly) then it's actually too WARM and chilling it a while will fix the problem. Don't ever throw out IMBC or we will have to whup you! 
Don't ever throw out IMBC or we will have to whup you!
Funny you say that ceshell, yesterday I did throw a batch out! 
I usually use smbc but read somewhere that imbc holds up better in humidity so I gave it a try.
The second the syrup hit the meringue it tried to solidify, leaving little chewy lumps all through the icing. No matter how I tried I just couldn't get rid of them 
I made sure I avoided the beaters and the bowl, what went wrong?
It was VERY humid here so would that have anything to do with it?
Sorry to hijack the thread
Whoops, nevermind, I forgot, that is a reason you are allowed to throw it out .
What method/recipe did you use to make the IMBC? I use Rose Levy Berenbaum (sp?)'s Moussline Buttercream, where you heat the syrup to 248, turn off the beater and pour in a bit of syrup, then whip 5 secs, then turn off and pour more in, then whip 5 secs, then pour the rest in. I am by no means an expert but for some reason this has always worked. (I hope I didn't just curse myself).
For what it's worth I have had to throw out SMBC twice because I cannot manage to keep the EW from scrambling. Chewy egg flecks, yuk!
Oooh Mousseline Buttercream is in the Cake Bible right? Love that book! I haven't tried it but will next time. I'm sure you haven't cursed yourself btw lol 
The first time I made smbc it scrambled, so now I lightly beat the egg whites till just frothy before putting them over the heat - haven't had a problem since. Also make sure the bowl isn't touching the water underneath 
Quote by @%username% on %date%
%body%