Same problem, I get it when:
a. DevTools is already open
b. I click the F12 key

Browser closes and then reopens.

This bug is now making Opera unusable for development purposes.

I've now given up waiting for a patch and have reinstalled a December 2024 version of Opera instead, over the current version.

I went to this version: https://get.opera.com/ftp/pub/opera_gx/115.0.5322.113/win/

DevTools is now working OK.

@Opera-Comments-Bot DevTools is broken.

You can start it, via F12 key.

However, if you start it again while it is already open, Opera crashes and restarts.

As a developer this is proving very difficult to work with.

@rumgezuzzl sadly, you're right. It worked for about 20-30 minutes, and then autoupdate (which one can't switch off) came along and ruined things.

Opera Devs -- is anyone there? Is anyone looking at this?

This bug is now making Opera unusable for development purposes.

I've now given up waiting for a patch and have reinstalled a December 2024 version of Opera instead, over the current version.

I went to this version: https://get.opera.com/ftp/pub/opera_gx/115.0.5322.113/win/

DevTools is now working OK.

Same problem, I get it when:
a. DevTools is already open
b. I click the F12 key

Browser closes and then reopens.

Sadly, doesn't work any more now that Apartheid Clyde has made like-lists anonymous.