>We c5 randomly on w7, w8 and w10.
>I have not seen a worsening with W10.
>
>For us, the biggest problem is that messagebox not appears,
>and that cursors give random corruption errors
>( redo same code and cursor works ! )

Is the vfp app running on physical machines or within VMs?
Since adding WinX VMs, some of the other VMs have more problems.
Either a side effect of WinX and Virtualbox or problems of a physical disk more strained...