I am getting an exit code 251 for this 82683481. What does it mean?

For this submission http://codeforces.net/contest/235/submission/25671023, test case #61:

Input
763116
Participant's output
2067834556
Jury's answer
444394078546562430

But see http://ideone.com/Ym8nSa, output is 444394078546562430 only.

Earlier whenever I submitted a solution, the information text "Running on test #" changes almost dynamically but now a days it just is constant and I need to reload multiple times to see any change. Is this functionality removed? or is a problem with browser (Chrome)?

I can't see any of my codes. I wanted to correct my solution to Petya and Countryside (Codeforces Beta Round #61) (Div. 2) but I get "You are not allowed to view the requested page."