Hi,
what do you mean by "sync", are you on github or some repository system? if that's the case then, PlayMaker should not be corrupted, UNLESS the master version of this rep has not updated itself, which in this case will always create conflicts, so contact the owner of this rep and ask him to update PlayMaker because you are using Unity 5. Which anyway will be odd because you should all be working ont he same version of Unity for a given project. Else you should branch your rep and merge later when all is well on the new branch.
Bye,
Jean