i found this to CRASH my prime :
try this programm,
1-on the first time wait 20 seconds all is alright.
2-then try to execute it again, during it press the down arrow key
3-the program finish with a result on the screen
4-try to escape with the ESC key
---THE prime CRASH
FROM NOW you see a busy indicator (a clepsydra) each time your prime is busy
EXPORT SPD()
BEGIN
TICKS>T;
FOR I FROM 1 TO 300000 DO
COS(123156789);
END
TICKS-T>T;
T/1000>T;
PRINT(""+T);
FREEZE;
END;
Edited: 29 Oct 2013, 2:20 p.m. after one or more responses were posted