For those who may not know what "Blue Gunk" is, here is an example. It consists of 6 overlapping transparent plains. Vue has an unpleasant limitation in that it can't pass light through more than 5 layers of transparency. At the sixth layer, all you get is the fadeout color, usually set to a dark bluegreen. This is exactly what you get in the above picture at the points where all six plains overlap. - SMT

I've had the same problem unfortunately, while trying to map a snow material to slanted cylinders. If you have too many overlapping you get these really unpleasant blue spots. I've never found a way around it. Same happens when I try to map clouds to spheres.

yep. well, what it is, is that 'murky' colour. you know in the transparency tab, where you have a sea-green shallow colour and a dark blue murky colour? you can try changing those to colours that match your environment better. but i really wish they would fix it :(