My clearcase polling is finding changes but a new build is not triggered.
I have my Hudson installed to /home/my_user_name/.hudson which is a symlink to another directory(/local/scratch/hudson/)
The problem is very similar to issue #3622 which are resolved. I am using the latest version of the plugin(1.1.1).
Unfortunately I could not try to have hudson in /home/my_user_name/.hudson without the symlink since I have not enough place there to checkout my vobs.

Last Base ClearCase Polling Log
Started on Feb 10, 2010 5:03:56 PM
[hudson_view] $ cleartool pwv -root
/local/scratch/hudson/jobs/myjob/workspace/hudson_view
[hudson_view] $ cleartool lshistory -all -since 10-feb-10.15:37:34utc+0000 -fmt '\"%Nd\" \"%u\" \"%En\" \"%Vn\" \"%e\" \"%o\" \n%c\n' -nco vobs/myvob1/ vobs/myvob2/
"20100210.164723" "my_user_name" "/local/scratch/hudson/jobs/myjob/workspace/hudson_view/vobs/Fil.cpp" "/main/my_view/my_task_branch/8" "create version" "checkin"
Minor code style.

Done. Took 0.2 sec
No changes

Edit:
I have now tried with both snapshot views and dynamic views and the problem is the same for both views.
I have also tried with different config specs/branches/views but the error is the same.