I made a fixed .nav file for the hostages on cs_jailhouse. It stops them getting stuck in the underground passage near CT spawn, and also potentially improves the hostages around the ledge here:
It won't work for people if they download it themselves, it has to be put on the server.
The download link is here
, hopefully it can be tested/put on the server soon.
Note: They still can't go up on the roof, hostages are completely unable to jump or use ladders.. they simply push against a low wall until they float up and over it.