SDCard fails to write if Nokia5110 is on SPI2 - expected or no?

var fs=require("fs");

digitalWrite(A13,0);
var g=require("PCD8544").connect(SPI2,C4,C5,­A3, function() {
        g.clear();
        g.drawString("LCD OK",0,0);
        g.flip();
});

Note that I did not do anything to the SPI2 setup anywhere, under the reasoning that, since the SD card works after doing var fs=require("fs"), doing that must perform any necessary setup.

The LCD works. The SD card does not:

>fs.appendFile("asdasd.sad","Veni, vidi, vino");
ERROR: Unable to write file : DISK_ERR
=false

If I don't set up the LCD, it works.

I was under the impression that SPI interfaces could be shared, as long as each device had it's own pin to select that device (which is lowered to select that device, ie, nss_pin in spi.send()) - is this incorrect?