Upgrade to Windows 10 causes app to minimize

[David_Anson]

I have a customer who was successfully using our app on his 2 year old Windows 7 machine for 4 months.  He upgraded to Windows 10 and now whenever he starts the App it immediately minimises and appears to disappear from his screen.  Doing an Alt-Tab just gives a small box and and X and it won't go full screen, half screen or any size box to view.  I have a Windows 10 installation which upgraded from Windows 8 and cannot replicate the issue and no other customers have raised it.

Any thoughts/similar experience?

TIA

[chris.campbell]

Do any of these tricks help?

http://www.howtogeek.com/howto/windows/bring-misplaced-off-screen-windows-back-to-your-desktop-keybo...

Windows 7: can't reopen minimised window on taskbar, preview OK - Super User