Hi,
I hope, I solve my problem, I rewrite all code this way:
(grids are sometimes ugly but timers always)
1) code, which creates my grids, are only in form.init()
2) before and after selects I never change grid.RecordSource and grid.ColumnCount
3) I find bug in my base grids class, which sometimes can destroy grids Dynamic... properties
4) I change timers event() method from thisform.select() to:
a) add CommandButton to form ('/ b) in click() it has thisform.select()
b) in timer event() I use KeyBoard '{ALT+R}' clear
It working from Thursday on 6 machines ...
Pavel