I wrote:

>     Preliminary investigations indicated that this bug
>     is nasty and dirty. It's in the garbage collector.
> 
>     It always crashed in primitive 130:

    This morning, I tried on a machine at work and couldn't reproduce it.
    This evening, it couldn't be reproduced on the same machine used last night.

    As I said, this bug is nasty and dirty. ;-)

    I give up.

    Cheers,

    PhiHo.