Issues w/ curved intersecting faces + issues w/ RoundCorners

[TopShedProductions]

I'm quite new on Sketchup but I've seen a million tutorials so that I could get out of this situation but it's still happening!
I need to intersect two cylinders and then I need to chamfer the intersected edge. The problem is that It isn't a neat intersection (as you can tell from the pictures) so when I try to create the chamfer with roundcorners what I get is a mess (as you can tell from the pictures as well). Am I doing something wrong? please help me because this thing is driving me mad!

Cheers:)

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[fred.dy]

kito raupp youtub

[pilou]