I got to almost the end of this age - got the planets realigned, and saw the final Bahro sign on the control panel - the two concentric circles, with a little circle on the top of the outer ring.
Then I went back to the linking bubble, drew that sign on my slate, dropped the slate on the ground, but the Bahro never came to pick it up. I tried this part over several times, but with no success. Could I have done some settings incorectly and still gotten the final sign?
I don't want to have to start this age over, but I don't know what else to do at this point.