LR2 hang in develop module with graduated filter

Question

I was in the Develop module and had just used the graduated filter to draw up from the bottom of the image. When I let go of the pen, the hourglass appeared and LR stopped responding. Many minutes later, I finally gave up and clicked on the window's close button. I got the usual Windows "app is not responding" dialog and told Windows to kill lightroom.
While LR was in the hung state, I started Procmon to see if anything interesting was visible there. While I saw no activity in lightroom.exe, I did see an endless series of operations in csrss.exe. These two operations were repeated endlessly:
543751 10:32:26.2519678 PM csrss.exe 1372 RegOpenKey HKLM\Software\Policies\Microsoft\Windows\Control Panel\Desktop NAME NOT FOUND Desired Access: Read
543752 10:32:26.2519724 PM csrss.exe 1372 RegOpenKey HKU\.Default\Software\Policies\Microsoft\Windows\Control Panel\Desktop NAME NOT FOUND Desired Access: Read
After killing lightroom, I no longer saw that pair of operations.
I have no idea whether this could be related to the lightroom hang or not, but thought I would pass it on in case it provided a clue.
Running Windows XP SP2 with all updates (except SP3) applied, nVidia 7600 GT, E6700 Core 2 Duo, 4 GB RAM (3.2 GB available), plentiful hard drive space free. Catalog is new with LR2 by re-importing all images; catalog was not converted from 1.4.1.

Answer 1

I'm having the same issue with graduated filter and adjustment brush and also one othe the predefined settings, I forgto which one, but it would lock up LR ervery time. My 30 day trial is now over and I think that I'm going to wait for LR2.x to be released :<(...
WinXP SP2, 3.0GHz Xeon 5260, 4GB, +30GB HD space