>A UDT is a User Defined Type. You said in your original question that your array is declared as of a UDT. How big is this UDT?
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Here's the description of the type:

Public Type Alignment
    StartIndice                  As String
    StopIndice                   As String
    Sequence                     As String
    LeftFlankingSequence         As String
    RightFlankingSequence        As String
End Type

The start and stop indice are maximum 9 characters long. The left and right flanking sequences are exactly 500 characters long each. The sequence will range from 20 to 4500 characters long.

Is it possible that the PRESERVE keyword, before creating a second array in memory, verifies that this array will fit in memory? Am I right in supposing that two arrays exist in memory at the same time when using PRESERVE?

Thanks again, Stephane.