I see, well the one you got with Mega link (there is no mega link for v0.6.1 in the OP) is the old one and yes that build has errors with the SD cards, check the changelog in the OP. It was a known bug but that was why v0.6.1b is bugfixes plus a new main menu that was still rendering (think it unlocks either when finish chapter 5 or 6 not sure, already had played chapter 6 when installed it, but I made a test run without my saves and persistent data like it was a totally fresh game and the main menu was different) when Digi.B released v0.6.
Always check what version you are playing before saying the game is bugged, it was, tested v0.6.1b without my persistent file and all run well like many times I said. There may have bugs that I didn't encounter but not those mentioned.
Ok but what version it says either in main menu right top corner or in the left bottom corner "about" button. Maybe you are running v.0.6 like the one the poster above yours shown.