Running a server patched with the 'B' hotfix and a vanilla FH2.45a client, the client crashes to desktop every time at the end of map load. As suggested, I removed the sp_ files from the server and reverted to the original serverarchives.con file: no change; client still CTDs at end of map load. So I tried with just the python changes from hotfix 'B' on the server, and now the client connects no problem. So, as you said, at least I can stop worrying about tweaking the 9999/9999 ticket numbers for some maps in coop mode. Next, I'll see what happens when I run hotfix 'B' on both server and client. If it works, I'll spend some time checking it out. If I like what I see, I'll make sure players joining my server know that hotfix 'B' is required.