The explanation eventually found was to do with Windows 8 NTCache and mrxsmb {Delayed Write Failed}. Looks like yet another Windows 8 bug which causes this error after resuming from Sleep mode.


>Hi Nick, I can't help with this specific problem but if the information you lost was personal info then you can probably get a copy of it from Microsoft since personal info is sent back to them ... you did read the EULA didn't you ;)
>
>I haven't noticed data loss when running VFP apps locally. Is this a local VFP app or accessing networked files? Using cable or wireless? Is there any commonality to the code behind the browse windows? Any file corruption? Did you check the indexes match the file correctly? Is disk caching on/off?
>
>>Has anyone noticed any issues with data loss on Windows 8?
>>
>>Entering some data and suddenly all the tables rolled back to their previous state a couple of hours earlier. No reason that I could see, these were just basic browse windows, all three tables involved seemed to do the same.
>>
>>It was as if table buffering had been turned on and then suddenly rolled-back but it hadn't.
>>
>>Has anyone else noticed similar behaviour on Win 8?
>>
>>Thanks,
>> Nick