I am having the same problem, in Dragon Valley no less. I have excellent computer specs that exceed recommendations. I've tried the simreset cheat, and reducing the graphics to no avail. I'd like to know if you have discovered a solution yet. =)
did you use the * in the reset sim cheat the other thing to try is your dragon is frozen have your sim interact with it anyways the dragon may appear invisible while the sim carries it or you will still see the frozen dragon on the floor but once the sim puts the dragon in its inventory it will not be frozen any more (and the dragon will no longer be on the floor). Your sim may also freeze while trying to interact with the frozen dragon. In this case, cancel the interaction, and both the sim and the dragon should unfreeze (kudos to nona )
