I'm impressed with the implementation, and thank you for taking the time to develop it. However, using this simple block of code :

SET CLASSLIB TO LargeArray
SET PROCEDURE TO LargeArrayMJ
CLEAR
loBeziers = CREATEOBJECT( 'cLargeArrayMJ', 3 )
WITH loBeziers
.Put( 1, 1, 1, 1 )
?.Get( 1, 1, 1 )
.Put( 2, 1, 1, 1 )
?.Get( 1, 1, 1 )
ENDWITH
RELEASE loBeziers
RETURN

I'm putting 1 in [1,1,1] then displaying it.
Then I'm putting 2 in [1,1,1] and displaying it.
It stays a 1... There loBeziers.nError is 12 after the second .Put().

Took a bit of fumbling with my program to figure out what was going on. Using VFP 7 at the moment. Any ideas ?