Thanks christopherb:
I am looking at the Test Logger - Log to File (or Log to Viewer).
When stuff happens, the lines come up with little icons (shown on P79 of UG), but I don't know what some of the icons mean so I don't know if I am dealing with errors in my rules etc.
For example, I could not understand the "error" situation I was getting with an icon of a yellow circle with an exclamation mark and red cross next to "...not evaluated during initialisation".
I assumed it was an error which I set out to fix but could not! Now I THINK it means that it is NOT an error - just a message.
But I don't know that for sure as I can't find where the icons are described as to what they mean.