With the newest patch (Patch notes are not yet up), there seems to be missing a file,
which will not allow test server client to start.
That file contains some shore battery files for HAs, and I don't think is included in the
"soviet navy patch" the game wants you to download.
I've uploaded it here for those who need to fix it.
http://vets-fleet.com/BNF/ITBTUNGN.spr
And just put that in your SPR folder where you installed your test server client.
-Angus