Multi-player Aircraft Elevation Problems

If it's been asked before...I humbly apologize. Could not find it when I searched the forums. Having recently gotten back into general flight simming versus combat flight sims, I picked up FS2004. I still have FS2000 and for the life of me can't remember what fixed the small glitch I'm seeing. Here's the problem...In multi-player sessions, my aircraft appears planted firmly on the runway or taxiway when viewed. Other multi-player aircraft appear a few feet off the ground (i.e. floating along). Is this a connection related issue, general multi-player glitch or something that can be corrected?I'm not running any add-on scenery...just the default stuff that came with the game.Sincerely,Steve StubbsUSAF (ret)