I encountered a severe issue today when uploading new images in a newly created NextGen Gallery, and I think the problem is due to an incompatibility between the recently installed plugin WPML (WordPress Multilingual used to translate my site in English) and NextGen (the essential gallery manager).
Description of the problem: Uploading images into NextGen results in cryptic characters and no image rendering.
A test with WP Media was successful, and the image came up without problems.
I have also found an issue between Ultimate TinyMCE and WPML, and I deactivated Ultimate TinyMCE.I will report the problem with WPML and Ultimate TinyMCE.
I am hoping you'd be able to provide a fix as soon as possible.
Thanks for helping,