@jelcin – There are some image upload issues we have resolved in the latest beta version of the plugin (http://www.nextgen-gallery.com/nextgen-gallery-latest-beta/) that may also correct this issue for you.
If you give it a try and it still doesn’t work, please submit your details on our Bug Report form so we can get a closer look at this. Here’s a link: http://www.nextgen-gallery.com/report-bug/
Hello photocrati, I have also been having the problem of not being able to successfully upload photos. I submitted a bug report several days ago. When will we have some changes or fixes? I am not willing to do the beta version, I would just like the version I have to work or have an automatic update of an official version. You can see the error on my site here: http://alexistmyers.com/portfolio/ If you look at the section named Custom Header and Facebook Images you’ll see the 6th picture has not uploaded correctly. I did all the other pictures about a month ago (when everything worked fine, before updating to the latest version I have), and I just did that 6th picture the other day. I would love some type of feedback, as I have heard nothing back from the bug report I submitted several days ago. Thank you.