This is a new bug we've never seen before...related to El Capitan on Mac.
Until we can fix the problem, here is the work around:
1. "Open Client" select "default.rp8
2. Enter "Dummy" in the top box...the combined name for report
3. "Save Client As" then NO to save changes to default!!! name the file "Dummy"
4. THEN - "Open Client" select "Dummy"
5. Go to Pro > Edit Current Open Client
6. Now you can change all the info to meet the needs of the client you are working without messing anything up in the base of the program and save it as the client name.
Until we get a fix for this, that's the work around.