Ok, we've made some Tests, and we can say, if any Windows Zoom on any Monitor is Active, the Error occurs.

>OK, maybe you could try some reporting tests:
>
>- Set the zooms the same on both monitors
>- Set the resolutions the same
>- Both of the above
>
>UPDATE: the above is educated guessing, but it looks like Bernard Bout has already gone through something similar and posted on Foxite: https://www.foxite.com/archives/vfp-9-behaves-badly-under-windows-81-0000401719.htm
>
>UPDATE 2: you might also want to check out later messages in that thread:
>https://www.foxite.com/archives/vfp-9-behaves-badly-under-windows-81-0000429415.htm
>https://www.foxite.com/archives/vfp-9-behaves-badly-under-windows-81-0000440857.htm
>
>There's some interesting background information if you google [visual foxpro high dpi monitor] e.g.
>https://blogs.windows.com/windowsdeveloper/2016/10/24/high-dpi-scaling-improvements-for-desktop-applications-and-mixed-mode-dpi-scaling-in-the-windows-10-anniversary-update/
>
>>Yes!
>>First Monitor HD Resolution 100% Zoom, Secondary 4k 150% Zoom
>>
>>>Are there DPI differences? For example, is 1st monitor a high DPI one such as a 4K laptop monitor, or a Surface Pro primary screen, and the other is not high-dpi e.g. a conventional 1080p monitor?
>>>
>>>>We can reproduce the Problem on several machines, and so the Hardware is different.
>>>>One secondary monitor is connected conventional DVI on the PC Grapiccard, one is connectes by USB "docking Station".
>>>>On both the Problem exists.
>>>>
>>>>Can anyone the Problem reproduce?
>>>>
>>>>"Funny": If i change in the Windows settings the first and second monitor, it's the same behavior. On the first Monitor it works, on the second the Problem occurs.
>>>>
>>>>
>>>>>>Hi @all!
>>>>>>
>>>>>>We have an reproduce-able c5 error / sometimes "Programm not respondig" Problem, if our Application is shown on the secondary Monitor of an multi Monitor System and if I run a Report (regardless of Reportbehavior 80 oder 90) regardless on Print Preview oder print directly.
>>>>>>
>>>>>>If I put our Application on the first Monitor everything's fine. So I Exclude Printer driver problems etc.
>>>>>>
>>>>>>Any Suggestions?
>>>>>
>>>>>How is the second monitor connected to the computer? Is it with a conventional HDMI, DVI or VGA cable, or is it connected by something unusual such as a USB monitor adapter?