Different behaviour of new and malloc

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It seems that no content is copied with memcpy if I allocate with 
new.
The memory is nulled.
If I allocate with GC.malloc or with .dup I get the correct 
content.
That seems like a bug. And I cannot give you an simple example 
because my code works together with derelict etc. Would be too 
much work to create an simple example.

The mysterious thing is:
I store the pixel into a file. If I store the original pixel I 
get only the correct output, if I don't use the allocations of 
newPixel with new.
If I use
ubyte[] newPixel = new ubyte[size];
The original pixel memory is nulled. That is the explanation why 
memcpy seems not to work: memcpy works but the original pixel is 
nulled so nothing is copied. But that is weird...