Crash

[CapnScurvy]

TMO_Visuals_for_RSRDC
Fixed_CD_sonar_RSRDC
IJN_Radar_Fix_2
Easier AI for TMO 2.5 by Orpheus

What makes you say these four mods are not needed and can cause problems?

I can't speak to the "Easier AI for TMO" mod, but the other three are already in the" OTC for RSRDC v502"

As propbeanie said, the games sh4.exe file is defaulted to "Read-Only" status. changing this parameter by unchecking the menu box and saving will allow LAA to work as expected. With a 64 bit OS, you'll gain double the defaulted memory access that the game originally runs. Should be a big help.

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Question: if I save a game with a contact on radar at 8nm distance, will that cause issues?

I don't think so. The usual issue is there's too much memory usage when you try to save (like a large convoy just off from the sub, or the game trying to render too much of the near by land, or a swarm of planes). A detected target that isn't even rendered yet at 8 nm shouldn't cause a bit of trouble. It's also possible that you should give the game plenty of time to save a game file completely before exiting the game. I know you should give the game plenty of time just to exit, before going to something else....adding a large save probably will require even longer to complete.