@danilotaku123 Not sure why that's in Spanish. The language must be set to Spanish somewhere.

I see the message basically says:

A profile error occurred
Your profile could not be opened correctly.
Some features may not be available. Please check that the profile exists and that you have permissions to read and write its content.

That usually means the profile at "C:\Users\yourusername\AppData\Roaming\Opera Software\Opera Developer" is being used by an Opera process or another process or its damaged or the permissions for that folder are not set to allow your user to read and write to the folder and its contents. I would rename that "Opera Developer" folder to "Opera Developer old" and then try to start Opera.

First though, I would make a test standalone installation of Opera Developer to a folder named "Opera Developer Test" on your desktop. If that Opera won't load either, there's probably really something wrong with Windows.

Does that Opera at least load right?

@leocg thank you

@burnout426

Hello. Nice to meet you. It worked. Thank you. I was not sure if addon extensions from Google [Chrome] worked in Opera. I see they do! I see Checker Plus for Gmail and Gmail Checker Lite also work as well.

Again, thank you for your help! Case closed.

You can hit ctrl + shift + j to load the error console to see if there are any errors for Twitter. Maybe one of the error messages will reveal something.

In the developer tools, you can switch to the network tab, check "disable cache", and hit ctrl + r to reload the twitter page to test if the network log shows any errors.

Also in the developer tools, you can hit the 3 dots at the top right, goto "more tools", choose "network conditions", turn of the use of the default user agent and then set Opera to identify as Chrome or Firefox. Then, ctrl + r to reload the page again to test if that helps.

You can also test with Opera's VPN on to test if that makes a difference.