Saved games are very particular about their 'lineage'. If you have Saved Games in stock SH4 v1.4, then you should only attempt to open those Saved Games in stock SH4 v1.4. Same with v1.5. Only open games saved in stock v1.5 in stock v1.5. If you add a mod, only open Saves from that mod. Not any other mod, not stock. Certain parameters in the game change between versions of the game, as well as between mods. You should not mix them. Some files are completely incompatible between the versions, and even between different mods. Generally speaking, it is highly recommended that you clear the old Save folder when making version or mod changes. You could save it away somewhere else, or rename the folder for future use, if you are ever back to that particular version. But don't try to use old Saves...
