O$ 5.2.3 loosing current line

[Franco Maregotto]

Hi listers

in a window I have these methods;
$doInit method:
...
Do tsk_StatemObj.$fetch(iList,kFetchAll)
If iList.$linecount>0 -- list has 3 rows
Do iList.$line.$assign(1)
End If
OK message  {A - line is [iList.$line]} -- HERE 1
Do method SetBtns
OK message  {C - line is [iList.$line]} -- HERE 0

SetBtns method:
OK message  {B - line is [iList.$line]} --HERE 0

iList is an instance variable (list)
This happens only with MacOS (10.9.4) and (weird) not always.
I mean that other windows with quite similar and simple code work good ($fetch into list, and if list is not empty set the first row as current line, then do some computations and redraw)
In Windows (7) all works as expected
I'm getting crazy. What could I inspect?
Did you already notice something similar ?

Many thanks for any reply

Franco Maregotto
franco at hotelaqua.it