I have the same old issue a million others have experienced; no thumbnails are being generated (A failure occurred), but the full image shows up fine when the broken thumb is clicked.
This was working up until a few months ago, and I admit I do update plugins fairly regularly when as update is available, as well as firmware for my Synology unit, although I honestly can't say for sure if the thumbnails for new images added were still working after my last plugin/firmware update.
I've gone through about 300 posts and I've yet to figure out my issue. The good news is I am hosting it myself on a Synology NAS so I can make any necessary changes. The bad news is I really don't know what is causing this issue, but here's what I know:
-The plugin check responds with all green checks
-My server settings pass the plugin requirements
-I have set post_max_size and upload_max_filesize to 256MB in php.ini which is reflected in server settings
-The folders (thumbs) have the necessary permissions for writing (although no thumbnails ever show up in the folder)
-Whether I upload 1 jpg or 10, large or small, resized or not, uploading via zip, flash upload or not, a thumbnail will just not be generated
-I get the same result (failure occurred) whether I'm uploading a new image, or trying to resize the image or creating a new thumbnail from the manage menu
When I changed the debug setting in the WP config file to true, what I did see was a memory error relating to gd.thumbnail.inc.php that referenced the line that ImageCreateFromJpeg was on. From searching, I found that others (specifically those hosted with 1and1) had an issue with this, but since I am hosting myself and can change my settings, I'm not sure what to make of it.
Does anyone know what I need to do/change/update to rectify this error?
Fatal error: Allowed memory size of 262144 bytes exhausted (tried to allocate 8192 bytes) in /volume1/web/mydomainname/wp-content/plugins/nextgen-gallery/lib/gd.thumbnail.inc.php on line 179
Line 179 refers to the following line:
$this->oldImage = ImageCreateFromJpeg($this->fileName);
If anyone knows what I can look for or what to test to try and fix this issue, I'm certainly all ears. :)