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.