Hello everyone and thank you for your help.
I've recently changed my work station, and today this thing happened to me 4 times and is pretty annoying :
When I'm working in the Hole Wizard, sometimes it becomes grey ( see the picture ).
SW stays responsive, but I can't exit this function, can't change window, and even can't quit solidworks.
I'm left with the only option to kill SW process.
Did this happened to anyone ? ( I changed the language of the computer if that may be a cause ? )