I have been told that Wacom is working on the Cintiq 24HD to solve the ArtPen problem.
They gave me no information about how long this process will take. The good thing is that they are working on it. The bad thing is that I lost more than one work due to this problems with the ArtPen.
The latest drivers for both Mac and PC (6.2.0-2) doesn’t fix the problem. This drivers have been removed from the download page but they are reported here.
I have the drivers installed on both my PC and my MAC workstations, and the good news is that they offer a very nice fine-tune possibility for the pen sensibility. I don’t know why they have been removed now, I will ask Wacom.
I hope to have soon good news from Wacom USA.