Hi, I had the same problem just happen all the sudden. I’m not sure, but it might be some sort of server-side group permission/creator permission thing.
If you’ve already tried setting the “gallery” directory permissions to 777 and it still doesn’t work, you might try just creating a new directory and moving all your existing gallery directories to it.
Moving your galleries to a new folder for web/Linux newbies:
Something like this (through your FTP application):
Create a new gallery directory under “wp-content” like “gallery-new”. Go into your existing “gallery” directory and rename/move each individual gallery directory to move it to the new gallery directory, like… for “my-awesome-nextgen-gallery”, rename it to
“../gallery-new/my-awesome-nextgen-gallery”. This moves it to the “gallery-new” directory. Once you’re done doing the rename/move for all your gallery folders and the original gallery directory is empty, you can just delete it or rename it to something else. You can then rename the “gallery-new” directory to “gallery”.
File manager applications in website control panels may have an option to move multiple files/directories too.
