(((8(|) Doh!!
... also Mea Culpa! Mea Culpa! Mea Maxima Culpa!!
Don't know how I made the mistake (prob. tiredness - see off-topic for 
details), it's GreebledRoundPrism or children thats causing the problem. I 
still can't see why its causing the Singular Matrix error but a few days 
should allow me to find a workaround or even a solution.
Thanx for the extra code - I'll look at it in between World Cup games, work 
and moving house.

John
-- 
"Please refrain from fondling the nymphs and sprites - it makes them giggly
and skittish.
Thank you for your co-operation.
The Management"

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