snort -s and -l at the same time?

[Sven Olensky <sol () intelispan net>]

I am using Snort 1.8 and encountered the following phenomenon: if I start
snort with -s and -l <logdir> at the same time, an alert file won't be
created. However, if I omit the -s, everything is fine.

Any ideas why?

thanks