Never seen this on my computer. My Win 7 system is set so screen goes blank and locks computer after 10 minutes - no problem when reactivating screen and signing back in. Is it the screen going blank or does your computer go into hibernate or sleep states at the same time?
I cannot purposely reproduce this... my computer is a Win 10 laptop. When plugged in it is set so it does not go to sleep. The screen and hard drive turn off after 30 mins. I set both of those down to 1 minute, but I could not cause the lock up to happen. I will try to look for more clues and report back if I can determine what circumstances cause the lockup.
This has now happened to me 3 times. I leave my computer with CircuitStudio running long enough for my computer to shut off the screen (30 mins). I come back to my computer and the screen is black and the computer is on, but unresponsive. Short press on the power button will not hibernate the computer as it is set to do. Ctrl-Alt-Del, Ctrl-Shift-Esc do nothing. The only solution is hold the power button to force the computer off. This has happened twice when I just left my PC for a while, and once when I locked my computer (windows key + L) with CS running. Is anyone else seeing this?
I am fairly certain that CircuitStudio is the culprit, as I have just recently installed and began using CircuitStudio and this has never happened on this PC previously. If needed I could do some further tests (set the screen off time to something ridiculously short) to verify. Really I have better things to be doing than this, so I was really wondering if I am the only one seeing this issue.