The CASRDO44 JCL Control page has a browse button that has access to my local machine and mapped drives.  Either the entry field is grayed out or values can be entered but using my mapping not the servers.

The environment variable CASRDO44_NEWSUB=ON is the default now within 6.0 and later versions of 5.1, this allows for submitting JCL from the browser’s local machine.
Change this environment variable to off either system wide or by adding it to the server region that is running JCL within the Configuration Information for that server region to allow access to the server drives without requiring them to be mapped to your machine.  A drive reference of C or D will now be the Server C or D drive. You may still have the browse button but it is still browsing your local machine, to submit jobs from the server you must know the full path and name of the job to submit.

From Enterprise Server Administration page select the edit button to the left of the server region; the Configuration Information is located on the General tab; once it is updated the server region need to be restarted.

[ES-Environment]
CASRDO44_NEWSUB=OFF

Note that for any environment variable to be accepted from the Configuration Information the first entry must be [ES-Environment] in the exact case.