[Plugin: NextGEN Gallery] Upload Image not creating thumbnail

I am reporting the same problem. 1.7.4 doesn’t creates thumbnails and slideshow doesn’t work in a widget. After I downgraded to 1.6.2 – everything works fine (could it be connected with webhosting services and allowed rights?)…

I was having the same problem. I noticed my thumbnails worked on one gallery, but not the other. I found this:

Nexgen Plugin Support

This fixed my problem. It was a memory issue due to large image file size. The bar would make it to 100% when creating thumbnails and I wasn’t getting an error message on my screen, yet the thumbnails never showed up.
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For Older Version:
You just edit the file “thumbnail.inc.php” which is located at: /wp-content/plugins/nextgen-gallery/lib/thumbnail.inc.php

Search for
// @ini_set(‘memory_limit’, ’128M’);

Change it to
ini_set(‘memory_limit’, ’128M’);

Now you are done, just save and upload the file.

For New Version:
You will not find the file “thumbnail.inc.php” instead you will find the file “gd.thumbnail.inc.php” which is located in the same location “/wp-content/plugins/nextgen-gallery/lib/thumbnail.inc.php” . You just need to edit this file.

Search for
// @ini_set(‘memory_limit’, ’128M’);

Change it to
@ini_set(‘memory_limit’, ’128M’);

It didn’t work 100% for me.

When i upload an image with the ‘upload images’ tab the program show’s me a thumbnail loader going to 100% and after that no thumbnail.

When i try to manually make a thumbnail in the manage gallery section it didnt work to. After I changed // @ini_set(‘memory_limit’, ’128M’); to @ini_set(‘memory_limit’, ’128M’); i was able to change thumbnail. But the uploader wasnt still be able to build a thumbnail after upload.

What could that be?

some more information and clearity :):

So after i changed the code following the instructions above, i can manually make a thumbnail, but it doesnt automatically make a thumbnail when i upload an image.

What seems to be the problem?