If you accidentally start an Installation Manager instance from the wrong user ID, some files might end up with ownerships that prevent normal use of the Installation Manager.
chown IMADMIN:IMGROUP /InstallationManager/bin
chmod 775 /InstallationManager/bin
and
chown IMADMIN:IMGROUP /InstallationManager/appdata
chmod 775 /InstallationManager/appdata
If the users of a group-mode Installation Manager do not have umask set to allow group-write permission on created files, you might also have to set the permissions and owners when switching from one user ID to another. You might also need to set permissions and owners for the product files that you install with the Installation Manager to ensure that maintenance can be performed from other user IDs in the group.