Keyboard freaks out by Wacom tablet

I have, since six months, a Wacom tablet (Intous 3 with USB-connection) connected to my iMac. Everything has worked fine until now: When the tablet is connected, my keyboard freaks out and generates only strange signs (I don't know the name of the keyboard layout, but it includes a lot of mathematical symbols, an apple-logo, etc.). If I disconnect the tablet and restarts - the keyboard is as it should be again.
I have updated the wacom-driver. This didn't help.
Any ideas?

enmanneleu wrote:
Charles Minow wrote:
One more thing I didn't think of before: what kind of keyboard do you have?
An apple keyboard. The new thin one with wire.
I have now tried the tablet on another computer (PC) and it worked but the LED on it flickered. Maybe because it did not get power enough? But I don't understand how this affects the keyboard?
Because the tablet and keyboard are both USB devices, there are certain things they share in common. Both are electrical devices connected to the same bus on the computer. And there would be a certain amount of commonality between their data paths once the electrical signals reach the computer. When you push a key on your keyboard, it sends an electrical signal to the computer that Mac OS X interprets as a key press. The tablet also sends electrical information to the computer, it's just interpreted differently by the computer.
This is a vastly oversimplified explanation, but suppose the keyboard sends its signals to the computer and identifies itself as USB device 1 and the tablet identifies itself as USB device 2. But the actual content of the signals each sends is pretty much the same, just data that represents a series of numbers. It's really important, then, for OS X to be able to distinguish between them, because the signal from the keyboard for pressing the letter "a" might be the same as the signal from the tablet when you click at a pixel 20 in from the left and 67 in from the top, with a pressure of 50%.
So, how would OS X be confused between the keyboard and tablet? It could happen for an electrical reason. For example, only part of the data from the tablet or keyboard gets to the computer, but enough that OS X can at least try to interpret it. Or, once the data gets from the tablet or keyboard, the software that listens to the USB devices tells OS X the wrong thing about the information it received. Each USB device has an associated driver that interprets the signals from that device and tells OS X what to do. There could be a bug in a driver that would take the signal from Device 2 (the tablet) and assume it came from Device 1 (keyboard), and then send OS X the wrong information. But I think it's less likely to be a keyboard driver bug if you use the default Apple driver, which you'd use with one of their keyboards.
The LED on the tablet flickering makes it sound like a problem in the tablet itself or with its USB cable, and not a problem with the software on your Mac. If you know someone else with a tablet who could let you borrow theirs for a short time, that would also be helpful. If their tablet works, and doesn't interfere with the keyboard, then you know it's more likely to be the tablet itself and not your computer.
One other thing is to move the keyboard and tablet to different USB ports on your iMac. I think you have four to choose from, right? Perhaps there's something wrong with one of the ports on the computer, a bent pin or maybe a piece of dust that's causing a connection not to be made.
charlie

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