same problem here! using Genius mousePen6X8" tablet
unless i´m drawing directly to the background, or have very few layers (less than 5) at a certain point, the brush stops brushing and only draws a straigh, very faint line from the start to the end point...
i too found that jiggling the opacity solves the problem temporarily... but only if there are very few layers... on heavier files it won´t even budge...
it´s absurd that they say this is a tablet driver problem! this didn´t happen with CS3! i feel cornered by adobe to trade in my dear old tablet for a far steeper-priced wacom... so unfair! i won´t buy a new tablet, for crying out loud!
sorry for the vent, i´m frustrated.... flash cs4 has no such problem... IT CAN´T BE THE DRIVERS!!! C´MON!!
I STILL HAVE THIS ISSUE... and no Chris, updating the driver DID NOT HELP. Funny that you said it's just the drivers, so why is it that when Photoshop starts drawing straight lines, when I go to Windows paint and try to do curve lines IT WOULD ACTUALLY DO IT. If the drivers are messing up, wouldn't it start doing straight lines in windows paint too?
WHY IS IT THAT NO ONE HAS FOUND A FREAKING SOLUTION FOR THIS!!!
Yes, I did... even uninstalled the pen tablet drivers to the hardware dialog box under My Computer properties. Uninstalled all instances of my pen tablet driver, then download the latest ones, and then reinstall... and still the same issue. If you click on the link that you said to click and read the REST OF THE POST, you will see that the fix stated in that post does not work for everyone.
Some people have stated that using the mouse together with the pen would cause the problem to appear, so they said to not use the mouse and the pen at the same time. I started doing that, but the problem is that my keyboard is attached to the same wireless receiver as my mouse, so whenever I use the keyboard for shortcut keys in Photoshop, the problem would start appearing for me even if I am not using the mouse. It's just really frustrating... and I can't just believe that it is just the pen manufacturer's problem. One guy in another forum stated that he has googled and searched for answers for months, and he has noticed that this issue is not limited to just one specific brand, making him think that it might be a Photoshop issue after all. It seems the issue had been around since CS2, how come no one have come up with a simple solution for this?
I don't use wireless anymore for a mouse or keyboard. Too many issues with the mouse drivers with Vista 64 and also PS CS4. Logitech setpoint was lagging sometimes with CS4. After I dumped the Logitech drivers and bought a USB mouse the CS4 problems went away. Same with the keyboard but that was with line of sight, sunlight and distance away from the computer causing problems. I was forever changing out batteries in the mouse too. I will keep away from wireless and logitech setpoint. Wireless was just too intermittent for my usage.
I had the same problem Months ago and posted it about that in these forums before the "reshape" of these.
For Genius Mouse Pen 8x6, in a very strange way, the solution was an updated driver. Is hard to believe but is true. Genius at the beginning of the year launched a new version of the Tablet's Driver.
Just Download it from the manufacturer. If you are using Windows XP Download the Vista Driver, it works, better this way because the XP dedicated driver is the old one.
I have documented this problem Since November 2008 in my blog (in Spanish) with all the issues to that subject. there are the links related to driver versions in case of conflicts.
The blog entry is titled (on Spanish) Photosop CS4 Failure with Tablet
Since the launch of the new driver I haven't any problem with the tablet. Also works fine on Windows 7.
It is actually the tablet. Especially if you are running a 64 bit version of windows. I had to make a very expensive switch to wacom when I finally figured it out. Most generic tablets (other than wacom) have a lot of problems.. Unfortunately for us consumers, we have little choice but to fork out hundreds of dollars to by an expensive brand. When I was waiting for my new tablet to come in the mail, i was able to temporarily solve the problem by having paintbox open and scribbling in there briefly before going back to photoshop.