Apparent Maildir permission issue

[Mark Foley]

I've just upgraded from Slackware 14.1 to 14.2. I've not done anything with dovecot -- it's the
same version that was running before the upgrade. However, now I'm getting a permission error:

/var/log/maillog:

Jan 16 13:09:44 mail dovecot: imap(mark): Error: opendir(/home/HPRS/mark/Maildir) failed: Permission denied (euid=3000026(HPRS\mark) egid=100(users) missing +r perm: /home/HPRS/mark/Maildir, conflicting dir uid=10001(HPRS\mark))
Jan 16 13:09:44 mail last message repeated 4 times
Jan 16 13:09:44 mail dovecot: imap(mark): Error: stat(/home/HPRS/mark/Maildir/.Trash) failed: Permission denied (euid=3000026(HPRS\mark) egid=100(users) missing +x perm: /home/HPRS/mark/Maildir, conflicting dir uid=10001(HPRS\mark))
Jan 16 13:09:44 mail dovecot: imap(mark): Error: stat(/home/HPRS/mark/Maildir/tmp) failed: Permission denied (euid=3000026(HPRS\mark) egid=100(users) missing +x perm: /home/HPRS/mark/Maildir, conflicting dir uid=10001(HPRS\mark))
Jan 16 13:09:44 mail dovecot: imap(mark): Error: opendir(/home/HPRS/mark/Maildir) failed: Permission denied (euid=3000026(HPRS\mark) egid=100(users) missing +r perm: /home/HPRS/mark/Maildir, conflicting dir uid=10001(HPRS\mark))
Jan 16 13:09:45 mail last message repeated 11 times

Permission on that folder are:

$ ls -ld /home/HPRS/mark/Maildir
drwx------ 17 HPRS\mark domusers 4096 Dec  7 23:07 /home/HPRS/mark/Maildir/

Permissions are unchanged since before the backup.

What do I do to fix this?

THX --Mark