try going inot my documents, find your maya folder and locate the prefs folder within. dont delete it but ad a 2 at the end of its name. restart maya and it will ask you if you want new prefs created say yes. see if this helps.
another thing is to make sure you dont have any mouse keyboard driver conflicts.
And after calming me down with some orange slices and some fetal spooning,
E.T. revealed to me his singular purpose.
--TOOL, 10,000 Days---