The link "Test out user’s permissions" in the ACP module "manage users" doesn't work anymore in 3.0.6RC2 and the latest svn (10196), probably because the hash parameter is missing:
- The working link on the profile page links to .../ucp.php?mode=switch_perm&u=54&hash=8bf8dccd
- The broken link on the acp links to .../ucp.php?mode=switch_perm&u=54&sid=<sid>