I just upgraded to version 1.3.0 of Image Watermark, and now Disable Mouse Click and Prevent Drag and Drop are not working. They’re even not working on old posts — users are able to drag and drop and right-click on these. My settings are as follows:
General
Automatic watermarking: on
Manual watermarking: off
Enable watermark for: large, medium, post-thumbnail, thumbnail
on selected post types only
post
Automatic frontend watermarking: off
Plugin deactivation: off
Image Protection
Disable right mouse click on images: checked
Prevent drag and drop: checked
Enable image protection for logged-in users also: checked