Usually a discontinuity is put in by the FMC to seperate the two ends of a cruise and STAR/approach phase or the end of a SID and climb phase.
Stick your map onto PLN and on the LEGS page of the FMC use the STEP LSK to review where your disco is - if it looks like a simple case of joining the dots then simply delete the disco in the FMC and the magenta line should join up fine and you can then fly the SID to climb or STAR down to approach fine.
It helps if you have and understand the SID/STAR charts for the airports you're flying into and out of. You can then match the published procedure with what you see on your display and if it clicks together in your head all you need to do is fly the damn thing and you're home and dry
If you want some up to date charts let me know. Email in trust.
Thanks for the info. I just worked out earlier how to fix the discos. Re-read the FMC manual which helped a lot! a lot of the functions in FMC aren't modeled but it still seems pretty good.
SID and STAR charts I have a good idea what goes on but the problem is that on vatsim you really don't know the runway in use until you contact arrival controller. If you have no STAR or there is no controller online I normally just self position for visual finals which is fair enough but I like getting to engage the twin cmds and fly the full ils with auto-flare etc.
Just found earlier on vroute.info how to export accure fuel figures which helps the realism - now I am flying mostly short haul stuff with 5-6 tonnes rather than the default where the thing is loaded with its max fuel.
Next aim is to master the 747 that is in your sig!