Some plugins will return a border. You could try running the plugin from XPE instead of directly from XXP. I set my system to lock the effect be default. With Akvis Sketch, without the effect being locked, the plugin will run again when I make a bitmap copy. I usually make bitmap copies in between, regardless. You may be confusing the program by having the last plugin active.

I set my system to use Photoshop as an editor because I can run plugins Xara doesn't see. And, I don't get an image with an extra border.

You might look close at the result if your trying a transparent graphic. Some plugins will return with pixels in the transparent area.

Rich