WacomTablet_6.3.19-6.dmg was release on Dec 23rd... I installed it... It removed ALL functionality of modifier keys (Command, Option, Control) in all apps which weren't "Wacom-aware". A BLATANTLY OBVIOUS MAJOR BUG... yet the driver was still released. This seems like standard practice for the folks at Wacom now... release something... wait for users to report bugs... make 4 more versions, all introducing NEW bugs over the next few months...... Eventually landing on a driver that seems fairly stable... so it remains in use for 2-3 years. Then they restart the cycle.... Horrible development and unlike Wacom in the 90s or 2000s. I suppose OSX may have made the difference, when they started REQUIRING reboots upon driver update (didn't need that before). I'm still using Driver 6.3.15-3 because thus far, it's the last release WITHOUT major bugs. I'll try this new 6.3.19-6 release, but I have little expectations that it will actually be bug-free -- more a matter of if I can live with the bugs it (probably) has. I don't necessarily blame Wacom for having difficulty squashing bugs... but it is their fault they releasing bug-ridden drivers without bothering to test them at all.