Saving in MGS

So here's the situation: Just got MGS. Good stuff. Played a bit, tried to save on card 1 (which also has my FF9 game) - and it said there was an error saving. Crap, I says. So I try to save on card 2, same deal. I quit, go into ePSXeCutor and look at the memcards - it says there's MGS data on both. Crap, I says again. So I go back in, try to load my game from card 1. It shows the savegame properly - "heliport, 16 mins", whatever. So far, so good. I try to load it, and get a loading error. Same thing happens with card 2. What gives?