Watermark not working.

Hi, i always used your plugin, and always worked good for my themes and website;
im used to run the free version, and now i changed up my wordpress theme, when a user uploads images tehy go to “media” but the watermark doesnt work!
could it be because this new theme is not using the standart wordpress uploads methods?

http://wordpress.org/plugins/transparent-image-watermark-plugin/