Preview images disappeared after 3.5 upgrade

Can you provide a link with the broken images? It’ll help identify if the web server is tossing 404 File Not Found or 403 Forbidden messages.

The error message (if any) is important as it will indicate which problem it may be.

The site is under development but you may see https://www.box.com/s/alomlm7870es3gkutk02
I’ll put in online for a while.
cainversiones.com

Some images are from external url and they show well.

That’s weird. I can see what you mean but some of your images are behaving oddly. This img URL actually opens up a web page.

https://cainversiones.com/wp-content/uploads/2012/10/Zrzut-ekranu-2012-10-29-o-12.37.50-215×215.png

That won’t work, do you have some plugin or .htaccess rules that’s doing that?

I was using Ultimate Coming Soon plugin but deactivated and the problem remain the same. .htaccess has not been modified
DirectoryIndex index.php
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

Maybe someone else has the same problem with preview images.

If https://cainversiones.com/wp-content/uploads/2012/10/Zrzut-ekranu-2012-10-29-o-12.37.50-215×215.png actually exists then try resetting your permalinks to the default ?p=123 and save that.

It’s only temporary and your .htaccess file should look like this after that change:

# BEGIN WordPress
# END WordPress

Or just delete the .htaccess file.

If that file does not exist then that would account for what’s going on… ??

I already did changed permalinks as you suggested and even deleted .htaccess file but remains the same. I even uploaded a new image after and doesn’t create the preview but I click edit image then it display it but after small edit and save returns no preview again.

Do you have any plugins installed? If so, if you disable them, does uploading new images generate thumbnails properly?

Hi Mike the only plugin I have installed is Ultimate Coming Soon but even after deleted and installed the latest version I had no success.
I uploaded a new image and made no preview only when edit button is cliked. you may see here what I mean: https://www.box.com/s/2gns3rfps5m6hbq5y25s

Does it still fail to generate thumbnails when both all plugins are disabled and your theme is TwentyTwelve?

If so, could you please post a link to your phpinfo() so that I can take a look?
You can find directions on the codex, here.

Yes it still fails but what I did was a wp 3.5 clean installation in a separate directory and export the content from the buggy site to the new one and it’s working as it has to be.

The buggy site had 3.4.2 version and updated to 3.5 through WordPress not from the host (iPage.com) control panel. However I made the new installation through the iPage Control Panel with a new DB.

Thanks guys!