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Is it very small or very big? (I presume the latter)
I can't seem to reproduce this. Could you do a step-by step guide on how you are able to reproduce the error? :)
How big is the mesh?
Scary - are you getting any errors in the console?
I can't really see how an absolute position would make that easier. Doing it in world space means that your shader essentially locks it into a single position, whereas if you use local position you can have the shader on multiple objects without having them end up at the same location.

However, if you *really* want to explicitly set the positions in world space:



But you won't be able to do that until 0.24, because this apparently triggers a bug which I just fixed :)
It's a big problem and I'll het it fixed :)

Has anyone had it happen on OSX?
Yeah. There is a bug when loading shaders, where it evaluates unnecessary amounts of nodes, some that have already been evaluated, so, if anything, it confirms my theory :)

Glad it's faster now anyway!