All of a sudden, in the past week or so, one of two things has occurred: Either (a) my fingers have become extremely dyslexic or (b) something's gone hinky with my MBP (late 2009, 10.6.6). In addition to a maddening lag between keystrokes (running from a split second to several seconds each time), the main problem is letters appearing wildly out of order. Approximately half the words in this post had to be deleted and re-typed to make it coherent. The problem seems to impact all programs although Mail seems particularly hard hit. I've disabled the most likely culprit (Spell Checker). No change. anC't (see what I mean?) find much in Google searches either. Any ideas? As someone who types fairly fast with astonishing accuracy, this is going to drive me to drink. Heavily.