pieter vijfvinkel brought this issue to our attention:

"by the way there is still this user removal issue - also with 1.7.1 - you have to click 'delete' twice - and if you investigate the log you notice some 'caching' issues"

tested this with 1.8, which updated both the caching and the trigger methods. Seems to be working fine now.

  --Ethan McCutchen.....Fri Feb 03 11:26:35 -0800 2012