Well, that fix actually worked until my Windows crashed, and I had to do a fresh install. On this new setup, I made sure to have only one language installed, but the problem reappeared after 2-3 weeks.   I still don’t know the exact cause, but something must be getting triggered by either of these fixes—switching the language setting in the previous Windows install, and now, quitting OneDrive. ... View more

I just found a fix—though I’m not sure if it’s permanent or temporary. What I did was close OneDrive, and then the backspace/delete shortcut worked normally with the Polygonal Lasso tool. I’ve also closed and reopened Photoshop, and the backspace/delete function still works normally with the Polygonal Lasso. I relaunched OneDrive, and it’s still fine. Then I restarted Windows, and it continued to work normally. Not sure if the issue will come back, though.   Can anyone else try this fix? ... View more

Yeah, about the shortcut, it seems I was high or something. And the comment can't be edited.   Well, it turned out to be the keyboard language for me. Not only the "Esc" key, but I believe the "Backspace" and "Delete" keys are in the same position across all languages. However, when the problem occurred, neither of them worked too. Since I switched the keyboard language to US, I haven't had any issues. Zero. Nada. Nul. Nothing. I don't know the logic behind it, but it works for me. ... View more

rev: The shortcut to switch language/keyboard on Windows is "Left Alt Key + Space." ... View more

I've found another potential source of the problem, which is most likely the actual culprit for me: the language/keyboard setting in Windows. My system has two options: US and UK. When the keyboard is set to UK, many Photoshop shortcuts don't work, such as Foreground and Background color fill (ALT/CTRL + Backspace) and shortcuts for ESC, Del, and Backspace when using the Lasso Tool. So I switched it back to US and voila! Everything is working now.   Note: The shortcut to switch language/keyboard on Windows is "Win Key + Space." ... View more

I also experiencing this problem. I found a temporary fix which is by holding shift key (keyboard) on the first click when using the polygonal lasso tool.   So, everytime you want to use the tool, decide a start point on the image, then hold the shift key, click the start point with the polygonal lasso tool, release the shift key. Using this method, the Esc/Backspace key always function normally. ... View more