>What folder are you using for VFP temp files?
>
>>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 ! )

A folder within application folder.
The application it is a single instance.
Never vfp table it is shared with other processes.