I have an intuos 4 and pressure works just fine.  Maybe look into driver updates, other than that I don't know.  If you have the current driver, try reinstalling it anyway.  I have to do that at least once every few weeks because something goes squirrely on my system.

Also Larry, with CS5 you can use pressure on brushes other than caligraphic.  It is fantastic.

I am having the same issue with my Monoprice Professional Tablet.  (yes, I am a cheapskate)  I have tried downloading drivers, restarting, and everything else I can think of, but all of the pressure settings for the calligraphy brushes remain greyed out.  Can anyone help?

Hello all.
I seem to be having the exact same problem! i cant use the pressure option on illustrator, i cant seem to get it to work on photoshop either. 
I use mac, cs5 and bamboo fun & pen. Did anyone find a solution to the problem?

I'm with Todditron and the others with lack of pressure problem.

I'm on a Mac running OSX 10.6.6, with a Wacom Graphire4.

Pressure works in Photoshop CS5. In illustrator, pen works-making lines and scribbles as directed, but no variation with increased/decreased pressure. In the Brushes panel, I can double click on selected brush, opening an Art Brush Options window, and change width, roundness, etc from "fixed" to "pressure," but those qualities remain fixed, regardless of my pressure.

Wrote to and heard back from Wacom Help Desk. Followed their instructions..

"I would recommend removing your current driver by opening your Applications folder and double clicking on the Remove Wacom tablet icon or the Wacom tablet utility icon found in the Wacom tablet folder there.  Inside that removal utility you’ll want to click on the remove tablet software button and then enter your password to remove your current driver.  Once the driver has been removed you’ll then want to repair your disk permissions before installing the latest.  To do this if you open your Utilities folder at the bottom of your Applications folder, in there will be an icon for Disk Utility that you’ll want to double click on.  In the Disk Utility you’ll then want to select your Macintosh HD on the left hand side and then click the repair disk permissions button towards the bottom.  Once the permissions repair is complete you can then download and install the latest driver for your tablet from our website."

to no avail. Tried the process again, restarting the computer after repairing Disk Permissions and reinstalling newest tablet driver. No go.

Wrote Wacom Help Desk again. Will follow up here once I hear back.

-F

Wow I was having the same problem with the pen pressure and I figured it all out on my own by accident by just clicking on a new tab in the brush tool bar on the top.  Its Very Very Silly that adobe had no idea what the probelem was.  I feel bad for Wacom having to deal with this.  It has nothing to do with your driver, just this tab that overides your tablet. 

I had this problem & it was driving me MAD, but fotunately I found a solution prior to postal.  FYI: Runnning Creative Suite 5 with Windows 7 , intel i5 @ 2.5 +/- GHz, 6GB RAM, gobs of storage.  Posted plea for help with Wacom, they'll take 3 days to get mack to me.  Speedy, what?  Checked drivers @ Wacom, found mine might be out of date.  This even though W7 said I had the latest driver.  Tried the new Wacom driver.  This brought the "Pressure" variable live in the blob brush properties menu, but even then I had trouble getting the brush to respond.  I found the brush unresponive until raised the variation variable to about the size of the brush. 

Also:  This forum is supposed to be moderated, and I haven't time or patience to wiggle through all of Adobe's little sign-ins, authentication, registration BS, but notice my "screen name"  It's about the 4th or 5th on I've had.  I've been an Adobe customer, registering each copy, and duly registeringon forums  since Photoshop at least Photoshop 5.1, and a photoshop user via employer licenses since 2.5 and early Pagemaker.  I have more names, monikers, etc. at my registration email than, to use an old phrase, Carter has liver pills.    It's because every time I go to sign in the security doesn't like my responses. 

It hasn't been a good day.  All I've done is battle this stinking problem.

Robert

you do not have any settings for variations in the brush options so hence there is novariations occuring.

sethe brush options properly and it will work the way you would like it to as long as you have the right settings

I didn't quite understand what you wrote — looks like a text with all the usual typos, etc. Can you clarify? What settings folder? Where? I am having this same problem (thanks Adobe, yet again, for buggy software!) and don't have time for a non-fix.

Having the same problem with Illustrator CS4, I suddenly can't get the pressure to work with the blob tool, using the Wacom. Funny, because I had it working in the same image file yesterday. Baffling.

I reinstalled the wacom, still can't get pressure to work.

Okay - none of the above tips unfortunately worked for me (Mountain Lion, Bamboo Touch and Adobe Illustrator CS6). I googled myself silly, and this problem has been known for seemingly countless versions. Most suggest something along the lines above.

However, looking at a Youtube video, which also did not solve the problem, I found this comment:

Juan Coleman

On Mac OSX Lion. Still no pressure sensitivity for the brushes in Illustrator ONLY! Greyed out and un-adjustable.

Found a work around...

Go to BRUSHES PANEL, look for the tiny dropdown menu in the top right hand corner of the pane, click this and OPEN BRUSH LIBRARY. Find WACOM 6D Brushes, select this, a brush panel shows up with these brushes. DOUBLE CLICK one to take it into the BRUSH PANEL, double click it here again... When editing the WACOM 6 D brush you will now have pressure sensitivity

It works!!!

All thanks to Mr Coleman - unfortunately, the other brushes still don't work, but at least we have something. I hope it works for you guys too!

(I thought I repost it here, so hopefully people in the same boat will find it.)

Message was edited by: VeryFirstDenis to remove some weird formatting...

You choose your brush in the brush window

Double click on it

choose the thing you want your pen pressure to have effect on (in my example; diameter)

And put a variation number (from your setted diameter, how smaller it can get)

Here's a screenshot

Mountain Lion has munged all sorts of stuff, including my pressure options in Illustrator. But tonight I came across a suggestion to install an *old* driver for the Intuos 5. I went for the 6.1.7-5, listed as for OS X 10.4-10.6 Intel. I figured that qualified as "old." Hey, I was desperate.

And, to my amazement, it worked, and restored the pressure features in Photoshop and Illustrator. But I realized later that it didn't support the Touch features of the Intuos 5 Touch. I didn't miss the feature, because I don't care for trackpads. But you might love it.

So, to restore your pressure options and keep the Touch, try the WacomTablet_6.3.1w2 driver instead.

It's stuff like this that shoots an evening that was supposed to be devoted to production. Grrr. Arghh.