Apply watermark to all previous images

Hi,

I have just installed your plugin, but found that watermarks can only be applied to images uploaded after the plugin install. I can see the option to apply my watermark on all previous images but upon hitting the Apply button, the watermarks do not apply.

Also, I was hoping the settings would mean that all previous images were also given the watermark automatically and I would not have to apply this individually as I have over 300 images on my site.

Any help would be greatly appreciated as this is certainly the best plugin I have found for this task (if it can work properly!)

Many thanks,

Dan Child

http://wordpress.org/extend/plugins/scissors-watermark/