XSI : parameter connection editor crashes

more often then not XSI crashes when I try to use the Parameter Connection Editor.

I can open it just fine, select the target, but when I try to select the source....kaboom, xsi is gone.

Very often when I save the scene first and reload it before using the connection editor, it works fine.

Has anyone else noticed this ? And is there something I can do to prevent this, besides reloading the scene that is.

thanks

edit: by the way, I'm using essentials 5.11