The mission list in my server.cfg file is not displaying after upgrading to OFP: Resistance version 1.85!

This is a known problem, which BIS already resolved in the version 1.88 beta dedicated standalone server download for Windows. The version 1.88 beta dedicated standalone server download also deals with multiplayer lag and desync problems originally reported for version 1.85. For equivalent corrections to OFP's Linux dedicated standalone server, see this FAQ item.

You can get the latest available standalone dedicated server version from BIS' downloads page.