I am using Delphi7.
I downloaded and installed IBO 4.6B the other day

A click of IB_Connection will display "Error reading
StatusBar.ExplicitTop.Property ExplicitTop does not exist."

This ExplicitTop is the property added by delphi2006.
Explanation of this property is described by the following URL.
http://jedqc.blogspot.com/2006/02/d2006-what-on-earth-are-these-explicit.html

Please remove this property if you please.