Aaaah!!
Ok... I ran a sim in version 2.42.9g and saved it. Then I loaded the sim in version 2.42.9i. I went into the shapes settings to change it back to how I want it, as it can't be saved in 2.42.9g. I set shapes to black, horizontal and vertical movement, slowest drift speed, bots can see shapes, shapes absorb shots. I didn't change anything in the GUI. Then I zoomed in, doubleclicked on a few bots to check them out. I found a couple of bugs here.
First I found that the first new mutation that a bot gets after the sim has been loaded isn't displayed in the robots dialog, e.g. you see the mutation description if you click on mutation details, but it shows as 0 in the list to the left. When it gets a second mutation it is displayed as 1 mutation.
The second thing I found is that sometimes a bot's vision radius looks like it sees something when in fact there is nothing there to see. I also found that sometimes just ONE EYE have a vision radius like several eyes.
When I was looking at that DB crashed on me.
There COULD have been a small shape hidden by the vision radius though, so I'm not certain on this one.