paltform is windows.
generate this bug:
within IDLE edtor.
first select some text.
second press down the shift key.
third  press  the end key.
fourth press the home key.
last IDLE quit with no message and document with no save.

Thanks for the report.  Python 3.1 only gets fixes for security bugs now, could you try to reproduce your bug with Python 2.7, 3.2 or 3.3?

I tried to reproduce it on 3.1 and 3.2 but it worked fine here (WinXP).
This is what I did:
1) open IDLE;
2) file --> new window;
3) write some text;
4) select with the mouse some text;
5) press shift and keep it pressed;
6) press end;
7) press home;
8) release shift;

I also tried in the "Python Shell" and releasing shift before pressing end and home, but I got the same result.  Shift+end highlights till the end of the line, shift+home till the beginning.

thanks.
new version 3.2.2 have not this problem.