Arduino Uno timer2 with SPI

[system]

void interruptSetup(){     .
 // TCCR2A = 0x02; 
//  TCCR2B = 0x06;  
 // OCR2A = 0X7C;  
 // TIMSK2 = 0x02; 
//  sei();    
}

RUN THIS.
IF YOUR SD CARD WORKS THEN THE ANSWER IS YES (IT IS INTERFERING).
That's simple enough isn't it ?