What's wrong with my Boolean?

I'm trying to do a boolean subtraction, and I'm not sure what I'm doing wrong. I'm just trying to make some holes in the side of a cylinder, but the whole thing disappears. I'm pretty sure I'm doing this right. Any help would be appreciated.
 

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Ah, thank you!

I'd also like to say, I love Cheetah3d! It's a fantastic 3d modeling program, simple, nice UI, easy to use. Just excellent for the price.

Thank you for your help.
 
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