V1.3.2 UVNC Viewer crashes on multi display setup

[JoeGlue]

Hi!

I use UltraVNC 1.3.2 server on my netbook (Win 10 Home) which has a second display attached.
From my desktop PC (Win 7 Pro 64 Bit) I use UltraVNC Viewer 1.3.2 to have a remote view of that second netbook display.

After connecting, the viewer first works fine for a few seconds or minutes (= this means that the settings are OK) and then crashes.
This behavious is independent of the way, the second display is used (I tried all options on the netbook: extend desktop, mirror primary desktop, second display only).
I also tried several settings in UltraVNC; the result remains the same.

I looked into
C:\Users\%USERNAME%\AppData\Roaming\UltraVNC\
but there is no crash log stored.

Any idea how I can proceed to solve the problem / help you finding the root cause of the crashes?