How are you syncing the client and server? Do you sync them with the same frame rate or the same servertime? For example with the latter the server would send, PLAYER B will arrive at this LOCATION at this TIME. What do you do when the client is out of sync? Do you interpolate so that things go speedy gonzales until the client catches up or do you simply "jump" to the right state?

I do not have any experience with game programming. Nonetheless, depending on the game, I believe if the one user gets out of sync too much you should ignore skip to the most current data. Otherwise, the play would never catch up on time.

Kuphryn