シングルプレイのセーブデータが読み込めなくなりました。

[Gontaron555]

下記のエラーメッセージが表示されセーブデータの読み込みができなくなりました。

Fatal error!



VERSION: 280.130
UnknownModule!UnknownFunction (0xffffffff00000000) + 0 bytes [UnknownFile:0]
ShooterGame.exe!UWorld::LoadFromFile() (0x00007ff704e66cab) + 0 bytes [d:\build\pc\engine\source\runtime\engine\private\world.cpp:6535]
ShooterGame.exe!AShooterGameMode::LoadWorld() (0x00007ff7039cd5bb) + 722 bytes [d:\build\pc\projects\shootergame\source\shootergame\private\shootergamemode.cpp:1660]
ShooterGame.exe!AShooterGameMode::InitGame() (0x00007ff7039c22c0) + 0 bytes [d:\build\pc\projects\shootergame\source\shootergame\private\shootergamemode.cpp:1024]
ShooterGame.exe!UWorld::InitializeActorsForPlay() (0x00007ff704e5a98a) + 43 bytes [d:\build\pc\engine\source\runtime\engine\private\world.cpp:3181]
ShooterGame.exe!UEngine::LoadMap() (0x00007ff704e2fef4) + 0 bytes [d:\build\pc\engine\source\runtime\engine\private\unrealengine.cpp:10164]
ShooterGame.exe!UEngine::Browse() (0x00007ff704e2ab42) + 38 bytes [d:\build\pc\engine\source\runtime\engine\private\unrealengine.cpp:8873]
ShooterGame.exe!UEngine::TickWorldTravel() (0x00007ff704e2b820) + 68 bytes [d:\build\pc\engine\source\runtime\engine\private\unrealengine.cpp:9045]
ShooterGame.exe!UGameEngine::Tick() (0x00007ff704b6e69f) + 0 bytes [d:\build\pc\engine\source\runtime\engine\private\gameengine.cpp:1143]
ShooterGame.exe!FEngineLoop::Tick() (0x00007ff7035b6835) + 0 bytes [d:\build\pc\engine\source\runtime\launch\private\launchengineloop.cpp:2421]
ShooterGame.exe!GuardedMain() (0x00007ff7035b0c7c) + 0 bytes [d:\build\pc\engine\source\runtime\launch\private\launch.cpp:140]
ShooterGame.exe!GuardedMainWrapper() (0x00007ff7035b7d9a) + 5 bytes [d:\build\pc\engine\source\runtime\launch\private\windows\launchwindows.cpp:125]
ShooterGame.exe!WinMain() (0x00007ff7035b7ec8) + 8 bytes [d:\build\pc\engine\source\runtime\launch\private\windows\launchwindows.cpp:209]
ShooterGame.exe!__tmainCRTStartup() (0x00007ff705e23931) + 21 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]
KERNEL32.DLL!UnknownFunction (0x00007ffbeda13034) + 0 bytes [UnknownFile:0]
ntdll.dll!UnknownFunction (0x00007ffbef7f1431) + 0 bytes [UnknownFile:0]
ntdll.dll!UnknownFunction (0x00007ffbef7f1431) + 0 bytes [UnknownFile:0]

画質を下げたりSLIを切ったりしてみましたが、状況が変わりませんでした。またメモリ4G制限で起動しても同じメッセージが表示されてセーブデータが開けませんでした。
どなたか同様な症状に対する解決方法をご存知でしたら、よろしくお願いします。