Ok, thanks you for the quick response time, much appreciated.
I will report this to bukkit, but to be clear I am using the supported Bukkit scoreboard API, and I still get this crash. This may be paritally due to the fact we are using a proxy as well, so I'm sure this may neither be a bukkit bug.
These are valid packets used by the Bukkit API, do you suggest this bug is taken to them instead?
I do know it's predicting, but it predicts things it should not need to and makes the playing experience in some occasions just look wonky and unprofessional, there are games that do a much better a job of this than minecraft does.