First i'm very sorry if my english it's not the best.
I'm even don't know very well how atmel works. But i will try to help you...
After you have TL866 "A" version you can do also ICSP programming. Select your device and click in the "set interface" menĂ¹ "ICSP port" option.
After that you can click on the information TAB and you should see the interface schematic. The capacitor that i'm talking should be added in parallel to each pin of the external crystal. 22pf are enough.
You can look at this image to show you what i'm talking about:
click me Do you see in the left the two 22pf capacitors?
IIRC atmel need external oscillator when you use ICSP programming interface