I've found that disabling AutoComplete 2.14.2 problems gone.
It seems they are not shadows but duplicated narrow text overlapping what's in the text box.
It is very strange it happens in some form input boxes of some websites.

The worst is Webmin/Virtualmin remote server control panel

And in their site

http://i.cubeupload.com/enyFQ5.png

Thanks

http://i.cubeupload.com/Cf1dGY.png

It also happens here in "Discussion title" input box but the shadow distance is not that bad, I still can read what I am writing

No, they are not.
I erased all cookies again and this time all went good!

Yes, I have.

I cannot login in a phpBB forum. The issue is that I get a notice "Login sucessful" but after a second I am redirected to login page.

The other is a news site. I log in but displayed page is like I am not logged in.
(I am migrating from Firefox)

Thank you

The file I'm trying to import is .pem and contains both certif and key

I have my own protected web pages (Linux protected dirs).

Each time I reopen Opera I have to enter Usernames and Passwords for that pages.

Is it possible to remember them to avoid every time to have to enter them?

I have "Offer to save passwords I enter on the web" checked but "Saved passwords" is empty

I already had tried that before posting here.

From the Invalid Certificate warning I chose Show Certificate and exported it to a crt file.

Then, from Settings - Privacy I imported it and got
"The private key for this cliente certificate is missing or invalid"

Self-signed. It is implemented when you install Webmin/Virtualmin system control panel (Centos 6).
It seems I've been entered in a regular behavior. No more requests about https security after sys wake up, only after restart/reopen.
So I am requesting Opera to 'remember' my trust. Thanks