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In some pages a math block is not rendered. The problem seems to be connected
with the beginning of the formula.

In the provided URL, 
  :<math>Y \sim N(\nu, \tau^2)\,</math> 
is not rendered. Adding \, seems to solve the problem
  :<math>\, Y \sim N(\nu, \tau^2)\,</math>   

http://en.wikipedia.org/w/index.php?title=Sum_of_normally_distributed_random_variables&diff=78843980&oldid=76452236

It works for me: http://en.wikipedia.org/wiki/User:Simetrical/7455.  Please
reopen if you can reproduce.  I'm guessing that the purge of the page cache did
the job, rather than your addition of an extra "\,", so that can probably be
removed if you like.

It seems quite consistent. If I change the Y with 

It was a filtering problem..it was quite consistent and I thought it was a bug.
ps. Sorry for the mess :)