There appears to be a bug in the C-Bus Calculator for the Homesafe panel. These are the steps I used:- (1) Entered a number of Input and Output units. (2) Clicked the "System" tab and selected "Homesafe Security Panel 16 zones with C-Bus 5400/16CB". (3) Clicked the "Selected Units" tab. All units, including the Homesafe Panel appeared in the list. (4) Saved the project and closed the program. (5) Started the Calculator again and opened the project. A warning dialog box displayed the following message "Unknown unit Cat. No. 5400/16CB ignored". (6) Checked the "Selected Units" tab. The Homesafe was not in the list. I have repeated the steps several times. The result is the same each time. The Calculator was downloaded recently and the file name was "Calculator_2_3_0_Setup.zip" but within the program under Help/About the program is listed as "Version 2.2.0 (Build 2) Data Version 1.0.0"