I\'ve been having a lot of issues lately, basically since the last time I upgraded XAMPP for OSX (v1.7.3) and/or my MySQL GUI tools. Using MySQL Workbench (v5.2.44), I can
Close and reopen Workbench. it worked for me.
Stop server.
close workbench window
start server
open workbench window
worked for me .. windows 64bit