I have given all four of the machine pieces to the rightful owner..He has told me to talk to him when he has it all put together..I tried talking to him and the guy you are supposed to give the heartstone gem too..However, neither of them say anything and Larrius(sp) does not take the stone..I have done everything else in the Severed Hand..Can anyone help me on this problem?

<font face="Verdana" size="3" color="#00FF00">Try resting, then talk to him.</font>

I have tried resting as well as going back to the main town..But unfortunately that didnt work either..

I think I heard of a similar bug before...
Try patching.... then if still not working reload a previous game