FCS 1.5 Not all Active Directory groups visible in list

We are having exactly the same problem. How many groups do you see in the Final Cut Server add group window, and how many do you see without searching in your Workgroup Manager or just running ls while in dscl interactive mode?

oh, yes, I also run fcsvr_client list_groups --xml > ~/Desktop/groups.xml
and got the list of groups that Final Cut Server "sees". I got the number of 2,094, while Workgroup manager stops flat on the number 2,000

I found a solution, though it might be still temporary. See if you can narrow down your Directory Search Policy. In your AD forest, you might need just one domain for your department, location, etc.
So, in Directory Utility, click on Search Policy, delete "/Active Directory/All Domains", don't apply yet, but click on the plus sign, and see what specific domains you can choose from there. Do the same to contacts.
Though still I can see now 1.592 records of groups or users when I run dscl but at least I know that AD administrators can really clean up our groups listings ( some of those groups are not being used) , and try to keep the number under 2,000.
It has to be a way to increase the default number of 2,000 in Search Policy, but I haven't had time to do that

I am still having this issue -- has anyone come up with a solution? I need to add groups to FCS but the groups are not in the truncated list.

You should take a look at Vitali post, narrow down the search policy, that's the only way for now.