/dev/pts/7: Operation not permitted
I just added a few new users to my Slack 9.0 system. Everytime I 'su - <username>' to these new user accounts, I get the following error --> '/dev/pts/7: Operation not permitted'. I looked high and low for an explanation of what could be causing this, but found nothing. Eveything else seems to work about the account. When I 'su' to the account, I do actually get to login and start in my home directory. So.... I guess it is more of an annoyance than anything else. Thanks in advance for any help......