I started using 2.4.2 tonight. The guiding screen is very dark as compared to what it used to be, and I have all the same parameters--High gain, 0.2s exposures. 2600MC-duo. At first it selects the usual 12 stars, but slowly over the last few minutes I'm down to six stars. I've never ever seen stars drop out--especially on a clear night. And why is the guiding screen so dark now? I don't mind it darker, but losing guiding stars that I can still see in the guide window is new. And as I wrote this, another is deselected and it's down to five.