Still using the same proto-board
http://www.picbasic.co.uk/forum/showthread.php?p=31405
So I'm sure that has a big affect on everything.

Here's the results I got.
Code:
	Error window	Recognized	RX Data
        ------------    ------------    ----------
No Cap	YES		Never		n/a
20pf	YES		Never		n/a
40pf	Intermittant	Occasionaly	NO Data
100pf	NO		YES		NO Data
220pf	NO		YES		Sometimes
440pf	NO		YES		Almost Always
.001uf	NO		YES		Always
.01uf	NO		YES		Always
In this case, anything below .001uf either doesn't work or is unreliable.
But I'm still sticking with .22uF

.