[Plugin: User Access Manager] broken image link

Hi there,

at first, this is a very nice plugin, very easy to setup, good job. One problem i have got is about inserting images after the “User Access Manager” was activated. I know, i have to renew every image, but everytime i try, the link of this image is pointing to e.g. “http://imagename.jpg”. WordPress is directly running in the root directory of my webspace, so it’s removing the domain-name when generating the image-link.
Does anyone have any ideas whats wrong? How should the image-link look like? Is it possible that any php-plugin or something else is missing?
I also tried some older version of this plugin, same behavior.

thanks in advance
Carsten