thank's

i made some tests and i had replaced the line 567 by
$frmHSTable = nothing
that solved my problem.

to be sure the high score form to be visible, i added too
$frmHsTable.TopMost = 1

now i can save my scores,
Beginner=94687 for the fun
Intermediate=47304 for test
Expert=47833 (my favorite level)
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Christophe