If you just minimized the window and restored it, it's an engine bug. I used the beta version of AGS; maybe this is the reason. Do you have any other detail about the crash?
I can reprodice it any time I am in full screen mode, then hit the windows button and go to another program, then click to go back to the game on the task bar. I have the .dmp file that was produced when it crashed. Would you like me to send it? If so, where to?
Ah, yes, you are right! Full screen, then ALT+TAB, switch to another program, and then try to restore the window. I will send the crash report to the AGS community. Thanks!
To solve the bug, run winsetup.exe and select "Driver=OpenGL". With OpenGL, you can switch windows without problems. In the next release, I will set OpenGL as default.