The Insercorp Development Team has deployed a iPlasmaCMS2.8.3.7  Hotfix, correcting the issue related to uploading images within various modules.

iPlasmaCMS2 - Version 2.8.3.7 Release Notes

Bug Fix

• There was a bug where the images would not upload properly to the Users, Pages, News, Gallery, and Staff modules, if the supplied image did not scale down evenly. This has been fixed so that the images will now upload and properly scale down to a web-friendly size.