It must be something your doing wrong. No one else is reporting this to Boris, and I am unable to create what you are seeing on 3 different computers here.
I suggest you re-read the PoKeys Manual, and the Help flash file that comes with the plugin...... Usually, in the past that I have seen, when something like that happens, there is something configured wrong on the pokeys, or you have the plugin configured wrong. In eigther case, when one or the other (or both), are configured wrong, that causes the pokeys to hang, or drop out, or do wierd stuff.
I recommend that you, load and use the PoKeys OEM profile and screen set that comes with the pokeys, and if still buggy and you think for sure you have all your configs correct, then un-install and reinstall mach3. then try hte OEM profile Pokeys again.
scott