If you've found a bug, you have to make sure that there is no other thread with the same bug.
If it isn't in another thread, make a thread with the subject "Bug: [Your bug]"
(If you make a subject like "Bug: WTF! Holy crap", nobody knows, whether he got the bug, too )
Now post your error log with the [ code]-BBCode:
(Click here for documentation about the error log)
Code
[code]
MeC-Error Log Here.
[ /code]