Sorry, but what is the "savegame" workaround? I play on Windows & have had the same issues re: Saving games
The savegame workaround is kind of a "inoffical" fix for linux and Mac versions of the game (also works on windows) to create savegames into the so called "playerprefs" insteadt creating a dedicated file called "MW_save_x.txt"
So if you play on windows than you do not need to enable the savegame workaround. (Usually)
If you play on windows and you are not able (or allowed due to folder rights) to create the savegames then you can also enabled this workaround in the gameplay menu.