I am system admin and supporter for soft- and hardware myself and I must say this is one of the weirdest problems I ever saw.
We are talking about a new laptop Dell vostro 3750 core i7 with nvidia and intel (optimus)graphics and 2 external displays (one VGA, one HDMI). OS is windows 7 enterprise x64 SP1, fresh clean install, no other known errors.
One piece of software behaves differently when run on the internal display compared to the external analog display. On the internal, everything is ok. On the external HDMI display, everything is ok, too. But when this app is displayed on the external VGA display, the application stops responding after a few minutes (always reproduceable), while all other apps, no matter on what display, run normal
To make it even more weird:
-when frozen, we can move the app to the internal monitor and it continues to work
-using a HDMI to VGA display adapter, the phenomenon happens on HDMI, too
-drivers and Bios are the latest available, tried older to no avail
-happens in single monitor setup (only external VGA) as well as in triple-monitor-setup with internal+HDMI+VGA, but always and only on the VGA connected device.
-it does not care for monitor models or resolutions (tried different).
-using that software on 5 other devices (pc and laptop), this does not happen at all on VGA
What could that be? An nvidia optimus bug?
Problem is, the owner needs to be able to use VGA for presentations (beamers sometimes offer only VGA in) and this app is always part of his presentations.