@BradHartford
The user under which the SAS process executes is the one writing the files. Depending on how SAS is configured and how users connect to SAS that can either be the actual user or a system account.
Besides of having the users in the right groups it might also be worth getting this sorted together with the SAS Admin as he/she should be able to do his/her bit in getting such permission issues sorted by "enforcing" a UMASK for SAS sessions.
http://support.sas.com/kb/38/040.html
https://communities.sas.com/t5/Administration-and-Deployment/SAS-Permissions-with-Windows-and-Unix/td-p/324204
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