Can mount samba volume, but access denied

[MgFrobozz]

I'm able to mount a samba volume using this fstab entry ...

//dopey/users /samba/dopey/users cifs user=dougs,uid=dougs,gid=samba_users,credentials=/home/dougs/.samba/credentials.omneon,file_mode=0777,dir_mode=0777

... but I see this when I attempt to access a file ...

> whoami
dougs
> groups
dougs uucp samba_users
> ls -l /samba/dopey/users/dougs/temp.txt
-rwxrwxrwx 1 dougs samba_users 6069 Jul 17 16:59 /samba/dopey/users/dougs/temp.txt
> cat /samba/dopey/users/dougs/temp.txt
cat: /samba/dopey/users/dougs/temp.txt: Permission denied

Any suggestions on what to change?