AVR Freaks

HI,

I am having trouble with a tiny20 implementation. A stock piece of code I've used before is failing on the 20.  It is a button debounce/handler. It reads a pin with a button attached and processes it.  My code sees the first button hit but then ignores more hits.  I am wondering if I have the pin input thing set up right, seeing as how it changed and the datasheet does not fill me with confidence. Here is the init code:

	// set up pins
	/* enable the pull-up function */
	PUEA = 0x30;
	PORTA = 0x30;	// PA 4-5 pullups
	DDRA = 0xCF;	// PA 0-3,6-7 outputs, 4-5 inputs
	DDRB  = 0x07; 	// PB 0-1-2 outs

I cannot debug as they changed it again and one wire debug is not available on the tiny20.

Thanks!