That sounds like a driver problem, but could also be a hardware problem with the tablet USB connection.
I'd suggest contacting Wacom support -- they're good at isolating problems like this.
The tablet behaves the same way on another computer
It sounds like a performance issue, does it happen with only the brush tool, does it happen with only a small file open, whats the other comp, and what version PS?
It does not only happen with the brush tool; in fact, it seems to behave similarly in other uses on the computer. File size does not matter. All my tests have been on blank sheets of paper.
If I try to use it as mouse--i.e., clicking and selecting by tapping on the tablet surface -- the reaction is delayed.
The worst problem is that when I lift the stylus off the page, it behaves as though the stylus is still on the page--for about 5 seconds. Only if I lift it far enough off the tablet for the tablet to not even see the stylus does it stop within that 5 second period.
I've written to Wacom, and so far all they've told me to do is reinstall the driver, which I've done several times without success. At least one problem is that the product I'm working with is a "Sapphire" tablet, and Sapphire is not one of the models to choose from. i'm told Graphire 3 drivers are supposed to work, but I'm awaiting further clarification from Wacom about what the right driver is.
I'm trying to make this work on two different computers, one a 3.4 Gig Core i7 iMac and a MacBook Air. Both are recent purchases, both are running Snow Leopard (10.6.8). I've got other machines I can test on (Leopard, Tiger, Lion), but my maiin machine is Snow Leopard and I need it to work on this one.
I'm using Photoshop CS5 Extended (12.0.4).
No good; I get a "version mismatch" message in the system proferernces.
I just solved the problem.
After talking with a Wacom rep, I learned that the nib can get crusted or just stuck in the "on" position over time. Just remove the nib with a pair of tweezers or pliers. Mine had junk at the juncture of the nib and pen. I cleaned it up, put the nib back in and --presto --it works again.
I also learned that in the older tablets it is extremely important to remove all prior software before upgrading to a new version. Wacom provides a removal utility in an applications folder called "Bamboo" or "Pen Tablet." This removal utility permits you to remove both the preferences (do this first) and then the application itself (including the utility). Many programs remove the old version on their own, but the older Wadom drivers do not.
This solution worked for me as well.