Buggy stuff going on!

Not sure if this is the right place, but here goes. Just finished another test. Sim went out to the opera with a friend sim, one of those rabbit hole 'I got tickets, want to come?' things. Sim walked off lot to go. Game speed stayed at 1, not speed up as expected. A short time later a shadow-like thing suddenly appeared in sim's living room, fluttered over to the chess table, and began playing with all the usual animations. Sim's portrait in the lower bar was greyed out, and had been once the sim left the lot. Shadow thing did various other things before going to bed, including gaining a skill point. Could hear sim's voice, but no sim seen. Decided enough was enough so bailed without saving, thinking that when went back in would start at prior save point. Wrong. When went back in the sim was back, and at the place where had bailed out. The gained skill point was there, too. So not only was there all that odd behavior, but the game saved when it should not have under ordinary circumstances. Something else the June patch broke?