Please help me with an editing problem

Hi folks,
What is this anomaly or feature and how do prevent it from occuring in the editor? It follows my cursor and ignores my selection such that I can manipulate my selection with the mouse wheel without any adverse effects from the anomaly apart from the visual impairment. It first appears against my wishes when I save a map, comes back when I reload it from memory and I can only get rid of it by restarting Red Eclipse. I am using Windows XP SP3 32-bit and game version 1.3.1. Thanks for your help.
Cheers
What is this anomaly or feature and how do prevent it from occuring in the editor? It follows my cursor and ignores my selection such that I can manipulate my selection with the mouse wheel without any adverse effects from the anomaly apart from the visual impairment. It first appears against my wishes when I save a map, comes back when I reload it from memory and I can only get rid of it by restarting Red Eclipse. I am using Windows XP SP3 32-bit and game version 1.3.1. Thanks for your help.
Cheers