Pen Tablet wedges

[kizlum]

Hello,

I own a Wacom Bamboo One USB pen tablet.
I don't know why, but I can't move the pen without that the cursor wedges and/or changes his position. This happens whatever the software I use. So, it's very annoying to draw with this problem

Have you got an idea about this sujet?

The tablet works well with my girlfriend's Macbook and with a friend's computeur running Windows. That's why I think the problem doesn't come from the tablet.

Thanks in advance.

PS: sorry for my bad English :/