Advanced settings resets prefix?

I have setup logging some time ago on a s3 website and it does not use the access-* prefix. So when I added the site to s3stat, I deleted the prefix and the s3 urls displayed looked fine. I used verify and then it took me to the next step "enable logging". Logging at S3 was already enabled, so its unclear why this step would be necessary...but I acknowledged it just in case it was used internally by s3stat.

After doing this, I was curious since no logs had appeared. In my impatience I went back to the settings and when I clicked the advanced settings it again shows the prefix.

Does s3stat not query the s3 bucket meta-data to read these back or save the settings that I had specified? Or does it require me to have some prefix (the default for s3 website logging appears to be no prefix now- just starts with date)

thanks...