log_threshold issue

When I change my config.php log_threshold from (0 or 1) to (2, 3 or 4) the server site returns only a http 500 error. I cannot get any logging to occur except for a date error issue I have yet to fix.  

I am at a loss for what to look for to resolve this.


On my development localhost things work fine, but on the server my site gets a http 500 error.

I would think this isn't a codeigniter issue but, not sure where to look to resolve issue.

Any help appreciated.