So after upgrading to v31291, I tried to load the savegame. It immediately crashes...
Load 'slot0' 20 subsystems
...Running subsystem 'base'
...subsystem 'base' - loaded.
...Running subsystem 'research'
RS_GetTechByID: Could not find a technology with id "rs_fighter_AND_particle"
......your game doesn't know anything about tech 'rs_fighter_AND_particle'
RS_GetTechByID: Could not find a technology with id "rs_harvester_AND_particle"
......your game doesn't know anything about tech 'rs_harvester_AND_particle'
...subsystem 'research' - loaded.
...Running subsystem 'campaign'
R_LoadImageData: image '***r_radarTexture***' is already uploaded
R_LoadImageData: image '***r_xvitexture***' is already uploaded
R_LoadImageData: image '***r_dayandnighttexture***' is already uploaded
...subsystem 'campaign' - loaded.
...Running subsystem 'hospital'
...subsystem 'hospital' - loaded.
...Running subsystem 'market'
...subsystem 'market' - loaded.
...Running subsystem 'employee'
Com_GetTeamDefinitionByID: could not find team definition for '' in team definitions
Error loading character definition for employee
...subsystem 'employee' returned false - savegame could not be loaded
music change to karlmacklin_geoscape (from van_theme)
Shutdown gametype 'Campaign mode'
music change to van_theme (from karlmacklin_geoscape)
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 interest subsystem
added mission subsystem
added aircraft 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 2456260 bytes
...techs: 200
...buildings: 19
...ranks: 16
...nations: 8
...cities: 457
Loading savegame xml (size 36786)
Loading savegame
...version: 4
...game version: 2.4-dev
...xml Size: 438629, 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 interest subsystem
added mission subsystem
added aircraft 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 2456260 bytes
...techs: 200
...buildings: 19
...ranks: 16
...nations: 8
...cities: 457
Load 'slot4' 20 subsystems
...Running subsystem 'base'
...subsystem 'base' - loaded.
...Running subsystem 'research'
...subsystem 'research' - loaded.
...Running subsystem 'campaign'
R_LoadImageData: image '***r_radarTexture***' is already uploaded
R_LoadImageData: image '***r_xvitexture***' is already uploaded
R_LoadImageData: image '***r_dayandnighttexture***' is already uploaded
...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 'interest'
...subsystem 'interest' - loaded.
...Running subsystem 'mission'
...subsystem 'mission' - loaded.
...Running subsystem 'aircraft'
CP_GetMissionByID: Could not find mission cat2_interest32_0
...subsystem 'aircraft' - loaded.
...Running subsystem 'installation'
...subsystem 'installation' - loaded.
...Running subsystem 'ufostores'
...subsystem 'ufostores' - loaded.
...Running subsystem 'production'
...subsystem 'production' - loaded.
...Running subsystem 'messagesystem'
...subsystem 'messagesystem' - loaded.
...Running subsystem 'stats'
...subsystem 'stats' - loaded.
...Running subsystem 'nations'
...subsystem 'nations' - loaded.
...Running subsystem 'transfer'
...subsystem 'transfer' - loaded.
...Running subsystem 'alien base'
...subsystem 'alien base' - loaded.
...Running subsystem 'xvirate'
...subsystem 'xvirate' - loaded.
...Running subsystem 'messageoptions'
...subsystem 'messageoptions' - loaded.
File 'slot4' successfully loaded from compressed xml savegame.
music change to karlmacklin_geoscape (from van_theme)
music change to van_geoscape (from karlmacklin_geoscape)
ufo: src/client/campaign/cp_aircraft.c:1201: AIR_Move: Assertion `aircraft->mission' failed.
./ufo(Sys_Backtrace+0x1f)[0x81ab7e8]
./ufo[0x81ab853]
[0x1e7400]
/lib/tls/i686/cmov/libc.so.6(abort+0x182)[0x8a8a82]
/lib/tls/i686/cmov/libc.so.6(__assert_fail+0xf8)[0x89e718]
./ufo[0x80a8f22]
./ufo(CL_CampaignRunAircraft+0xd2)[0x80a93bc]
./ufo[0x80cbd03]
./ufo(CL_CampaignRun+0x355)[0x80cc0a9]
./ufo(GAME_CP_Frame+0x15)[0x80702cc]
./ufo(GAME_Frame+0x26)[0x806f586]
./ufo(CL_Frame+0xba)[0x807caac]
./ufo[0x814dc00]
./ufo(Qcommon_Frame+0x7b)[0x814e064]
./ufo(main+0x5c)[0x81aa9ff]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe6)[0x891bd6]
./ufo[0x806cf21]
./ufo(Sys_Backtrace+0x1f)[0x81ab7e8]
./ufo(Sys_Error+0x22)[0x81aadc9]
./ufo(Sys_InitSignals+0x0)[0x81ab866]
[0x1e7400]
/lib/tls/i686/cmov/libc.so.6(abort+0x182)[0x8a8a82]
/lib/tls/i686/cmov/libc.so.6(__assert_fail+0xf8)[0x89e718]
./ufo[0x80a8f22]
./ufo(CL_CampaignRunAircraft+0xd2)[0x80a93bc]
./ufo[0x80cbd03]
./ufo(CL_CampaignRun+0x355)[0x80cc0a9]
./ufo(GAME_CP_Frame+0x15)[0x80702cc]
./ufo(GAME_Frame+0x26)[0x806f586]
./ufo(CL_Frame+0xba)[0x807caac]
./ufo[0x814dc00]
./ufo(Qcommon_Frame+0x7b)[0x814e064]
./ufo(main+0x5c)[0x81aa9ff]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe6)[0x891bd6]
./ufo[0x806cf21]
Error: Received signal 6.