Atmega16 USART initialization - usart

Question

I can't for the life of me find why this code is not working to send a byte to my computer terminal window. It receives and works fine when I omit that line though. Receiving and sending also work seperately. Please note that this is over rs485 so I must disable TXEN if I want anything received to make it through the line driver ic.
#define F_CPU 7800000UL // 7.8 MHz
#include <avr/io.h>
//#include <util/delay.h>
#include <avr/interrupt.h>
#include <math.h>
#define USART_BAUDRATE 57600
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)
volatile unsigned int value = 0;
volatile int recievearray[4] = {0,0,0,0};
volatile int x=0;
void USART_Init(void)
{
DDRD = 0x7E; //you have to assign TXEN as output for some reason
//PORTD = 0xFF;
UCSRB = 0;
//Put the upper part of the baud number here (bits 8 to 11)
UBRRH = (unsigned char) (BAUD_PRESCALE >> 8);
//Put the remaining part of the baud number here
UBRRL = (unsigned char) BAUD_PRESCALE;
//PORTD = 2;
// ASYNCRONOUS
UCSRC = (0 << UMSEL);
//Enable the receiver and transmitter
UCSRB = (1 << RXEN) | (1 << TXEN) | (0 << UCSZ2) | (1<<RXCIE);
//Set 1 stop bits and data bit length is 8-bit
UCSRC = (1 << URSEL) | (0 << USBS) | (3 << UCSZ0);
//no parity
UCSRC |= (0 << UPM1);
UCSRC |= (0 << UPM0);
}
void USART_SendByte(uint8_t u8Data)
{
UCSRB = (1 << TXEN) | (1<<TXCIE);
// Wait until last byte has been transmitted
while((UCSRA &(1<<UDRE))==0);
UDR = u8Data;
UCSRB = (0 << TXEN) | (0<<TXCIE);
}
void Led_init(void){
DDRC = 0xFF;
}
ISR(USART_RXC_vect)
{
//PORTC = 0xFF;
while((UCSRA &(1<<RXC)) == 0);
value = UDR;
if (x < 4)
{
recievearray[x++] = value;
}
else
{
x = 0;
recievearray[x++] = value;
PORTC = 0x00;
}
}
int main(void)
{
USART_Init();
sei();
Led_init();
//PORTC = 0xFF;
for(;;)
{
if (recievearray[0] + recievearray[1] + recievearray[2] + recievearray[3] > 100)
{
PORTC = 0xFF;
USART_SendByte(value);
}
//_delay_ms(1000);
}
}