I had a lot of problems last night with a flight from KSFO to KLAX.I used the PORTE3 dep with AVE as the transition than a SADDE6 arrival into LAX.I programmed the fmc and all was fine till I tried to put in the arrival at LAX as you have to cross SYMON at 12000 and everytime I put in the waypoint it would not accept it.The fmc would not even accept the runway assignment of 24L.The FMC would not put the waypoints in for anything after AVE.I have the new Navgraph data installed.Right before arriving at AVE was told to do a 360 due to LAXCTR was not taking the handoffs and the LNAV would not go into heading mode so a heading change could be done and I would disconnect the AP and the heading hold would not disconnect so I could change to a new heading.Any ideas on what is up?

                                                    JeffG