I'm using all the latest releases: 3.5.1 / ngg 1.9.10 / 1.2.2.
I've set up an image custom field called "storelink", shown in this screenshot: https://dl.dropbox.com/u/8887740/ngg-form.png
But when I go to save the form, it redirects to a 404 page: https://dl.dropbox.com/u/8887740/ngg-404.png
Three odd data points:
1) it works fine on my localhost set up... I can not trace anything that's different.
2) if I have nothing in the text inputs, and save the form, it works fine like normal
3) on both localhost and production, the URL is the same except for one added parameter "paged=1"
Can you direct towards what you think is the solution? Thanks for the help, and the plugin. It served my exact purpose on my localhost--can't wait to get it going live.