Inexplicable invalid memory operation when program terminates

[pineapple via Digitalmars-d-learn]

I have a program which I have stripped down to a single offending 
line which, when present in my program, causes an invalid memory 
operation to occur after main has evaluated:

    import mach.sdl.window;
    void main(){
        auto win = new Window(300, 300);
    }
The program is a bit larger than that, but I do not get the error 
when I comment out that instantiation and the things dependent on 
it.

I commented out the body of the constructor that is being called, 
and I still get the error.

Am I missing something or is this an obnoxious bug with the GC?