It was an issue with W3 Total cache. Since the Database cache was activated for non logged in users only, it was not working as intended anymore.
Now the weird part… The Database cache was activated for months and it always worked well, until I upgraded WP to 3.5.2 (and probably W3TC in the same time).
Related Posts:
- Missing feature image link function
- Automatically set the featured image
- Get recent posts with thumbnail
- How to display the_post_thumbnail if a post has one or otherwise display the first image in a post?
- Add options to featured image
- Linking thumbnail to full size image
- Generating Responsive Background Image Sizes in PHP
- Why are image thumbnails cropped proportionally (not per dimensions)?
- Add a Post Thumbnail to an RSS Feed with custom size
- Make WordPress size and name images for Retina.js
- Why are image thumbnails cropped proportionally (not per dimensions)?
- the_post_thumbnail fallback using hooks
- Display height and width properties with the_post_thumbnail() or related function
- Setting featured image with function, 1 part not working
- Removing the first image in content
- How to set the jpg image compression for specific thumbnail sizes?
- Function to auto-set a featured image that is already in use
- img width and height attributes being set by get_the_post_thumbnail
- Get the 5 lastest Featured Posts from a category
- How to display a default image for post thumbnail using functions.php?
- Change size and crop medium_large images
- Getting Featured Image Caption to Only Show if Populated
- wp_get_attachment_image function size argument not working if I also add a custom class
- Can’t check if a post has thumbnail adding filter to get_post_metadata()
- Add Featured image column into wordpress admin on pages AND posts
- Post thumbnail not showing in WP admin area for custom post type
- Overwriting Parent Theme’s Image Sizes
- Backstretch.js and thumbnail sizes to reduce loading time
- How to stop twenty fifteen theme from cropping featured images?
- Can you put a condition on add_image_size() depending on the width of the uploaded image?
- show first 3 thumbnails of posts in different sizes [closed]
- Set spesific size of featured images
- Can’t generate thumbnail images
- It does not work concatenation in function.php
- How to retrieve the current post’s generated featured image size?
- Check if the image size is available and if not use ‘full’ image size
- is there a way to remove featured image from blog page and single page
- How to hide image-url if no attachment?
- Can set_post_thumbnail be used to remove a thumbnail?
- Can’t locate custom image sizes defined by child theme
- How to add a new image size and apply it to posts only?
- Show Featured Image in else statement
- Change custom featured image size in twentythirteen child theme
- resizing of thumbnails not working
- Featured Image keeps cropping
- show all the posts thumbnails
- struggling with syntax for the_post_thumbnail();
- include w_thumbnail_src in function?
- Custom image sizes showing in Classic Editor only when upladed directly to post
- Which filter fires upon setting a featured image
- Can I use ‘Featured Image’ as a hero image and a thumbnail?
- remove_filter function to unhook twentysixteen parent theme function
- Can You Set A Minimum Image Dimension For Resizing Images?
- Featured image on archive page based on post type
- Printing medium sized image
- Sticky – Featured Image
- Frontend Feature image upload not work
- Best way to add image to recent posts widget?
- Slider Thumbnail Size Issue [closed]
- Remove Featured Images from Posts Older Than a Certain Date
- Apply height and width for the_content() inside youtube video tag
- Set thumbnail from URL, by grabbing image in functions.php
- add_theme_support not outputting thumbnails
- Full size image option removing problem
- Image width issue in IE [closed]
- image_size with respect to aspect ratios
- Is mytheme_post_thumbnails() still necessary?
- Get list of years when posts have been published
- Do WordPress’ cron’s clean up expired transients?
- How to add first name & last name to default registration form?
- Masking logout URL
- Warning/Notice about functions.php
- Searching for content post
- Using separate .php file for functions – how to run on site?
- Access Plugin data from Functions.php
- wp_nav_menu, walker class, categories as classes of li
- Calling a Function in Functions.php from an external PHP script
- Custom shortcodes not inserting into visual composer columns
- Adding a colorbutton in tinymce dialog with current api
- Post meta not updating
- Check if Page Slug Exists, then display that Page’s Title
- Why doesn’t is_page(id) work in functions.php?
- Enqueuing latest version of jQuery into a child theme returns a blank screen
- How to parse a shortcode within a shortcode?
- Variables not showing in short code
- Prevent loading of functions
- Shortcode question
- call_user_func_array() expects parameter 1 to be a valid callback, function
- Adding tables to the WordPress Editor
- Add Login and logout buttons to top menu bar
- implementing a centralized content “show-do-not-show” toggle?
- How to load a css file depending on the current role
- Add a word after the post url if it is within a specific category
- Security when outputing wp_oembed_get code
- Will dequeueing in child theme functions.php file prevent Google Fonts from loading?
- Graphic before title – Specific Category
- Edit meta fields from within template
- Adding a meta box fields to child theme options page
- Remove theme, change theme button and WP version on “Right Now” admin dashboard?
- Different ads on every website on multisite environment