problems with SD card

Just checked with 1v79 and an external sdcard (catalex SPI MicroSD Card Adapter V1.0) on Espruino V1.3. Connected like this:

SPI1.setup({mosi:B5, miso:B4, sck:B3});
E.connectSDCard(SPI1, B6 /*CS*/);
var fs = require("fs");
var i = 0;
fs.appendFile("Juergen.json","hugo\n");
setInterval(function(){
  digitalWrite(LED1,true);
  fs.appendFile("Juergen.json","emilio");
  setTimeout(function(){digitalWrite(LED1,false);},200);
  i++;
},2000);

Got same problems as mentioned above, lot of strange characters.