I have had this issue ever since Flash CS3, but I now see it
has persisted in Flash CS4 as well and I would like to see it
resolved. When drawing with the brush tool, using a Cintiq 21UX,
and also on a Tablet PC, under WinXP, I have been experiencing an
intermittent blob at the beginning of brush strokes when pressure
sensitivity is turned on. IT appears that Flash is registering
'full pressure' from the pen for a moment. I have attempted to fix
it via the Wacom control panel by turning on/off practically every
setting to no avail.
The problem appears to get worse the longer I have Flash
open. At launch, the problem is practically nonexistent. But as I
work it starts to creep up until it appears on almost every stroke.
It is immensely frustrating and disruptive to work flow. Closing
Flash and re-opening the file sometimes makes the problem go away
for a few minutes.
I don't experience this issue in ANY other program, so I am
led to believe it is a Flash specific issue. I have seen this issue
crop up on several PC's using similar configurations of Flash CS3,
CS4, Wacom Cintiq and/or Intuos tablets. All installations employ
current versions of Adobe, Microsoft and Wacom software.
It is not secret that the Flash IDE is very bad with memory
management. Very often, I need to leave Flash open for a time
inactive (I go on lunch or to a meeting for an hour) and when I
come back my computer is running extremely slow. A close and
re-open of Flash fixes the problem.
Your tablet issue sounds like a memory leak to me. Especially
since it gets worse the longer Flash is open.