Updated to version 31244 on 8/4. Could not load a saved campaign with new version. I had a previous version from 8/3 or 8/2, can't remember exactly which one, but that worked fine.
below is a portion of the output
Change gametype to 'Campaign mode'
--- save subsystem initialization --
added base subsystem
added research subsystem
added campaign subsystem
added hospital subsystem
added market subsystem
added employee subsystem
added aliencont subsystem
added aircraft subsystem
added interest subsystem
added mission subsystem
added installation subsystem
added ufostores subsystem
added production subsystem
added messagesystem subsystem
added stats subsystem
added nations subsystem
added transfer subsystem
added alien base subsystem
added xvirate subsystem
added messageoptions subsystem
Campaign data loaded - size 3341800 bytes
...techs: 200
...buildings: 19
...ranks: 16
...nations: 8
...cities: 457
Loading savegame xml (size 77888)
Loading savegame
...version: 4
...game version: 2.4-dev
...xml Size: 894805, compressed? y
Shutdown gametype 'Campaign mode'
Change gametype to 'Campaign mode'
--- save subsystem initialization --
added base subsystem
added research subsystem
added campaign subsystem
added hospital subsystem
added market subsystem
added employee subsystem
added aliencont subsystem
added aircraft subsystem
added interest subsystem
added mission subsystem
added installation subsystem
added ufostores subsystem
added production subsystem
added messagesystem subsystem
added stats subsystem
added nations subsystem
added transfer subsystem
added alien base subsystem
added xvirate subsystem
added messageoptions subsystem
Campaign data loaded - size 3341800 bytes
...techs: 200
...buildings: 19
...ranks: 16
...nations: 8
...cities: 457
Load 'slot7' 20 subsystems
...Running subsystem 'base'
...subsystem 'base' - loaded.
...Running subsystem 'research'
...subsystem 'research' - loaded.
...Running subsystem 'campaign'
...subsystem 'campaign' - loaded.
...Running subsystem 'hospital'
...subsystem 'hospital' - loaded.
...Running subsystem 'market'
...subsystem 'market' - loaded.
...Running subsystem 'employee'
...subsystem 'employee' - loaded.
...Running subsystem 'aliencont'
...subsystem 'aliencont' - loaded.
...Running subsystem 'aircraft'
CP_GetMissionByID: Could not find mission cat7_interest197_0
CP_GetMissionByID: Could not find mission cat2_interest199_0
CP_GetMissionByID: Could not find mission cat8_interest202_0
...subsystem 'aircraft' - loaded.
...Running subsystem 'interest'
...subsystem 'interest' - loaded.
...Running subsystem 'mission'
CP_GetMissionByID: Could not find mission cat2_interest199_0
Could not link mission 'cat2_interest199_0' in aircraft
...subsystem 'mission' returned false - savegame could not be loaded
music change to van_geoscape (from van_theme)
Shutdown gametype 'Campaign mode'