Well I was wrong, it's still flagged up by Avast!
Since last posting I've installed Avast on my 2nd PC, and just a few days ago ran muon1benchmark only to find it's still being blocked!
How come this hasn't been fixed?
Btw I have again reported it as an FP from within the program a few days ago.
Just to re-iterate this IS a safe program, checkout links I gave above.