Global list of Excluded IPs

I am unable to get into Settings/Websites to add IP addresses for exclusion.
Cannot find out why - have updated to 1.6 and reinstalled but still cannot get into Settings/Websites - just a blank page.

Can anyone tell me where Piwik stores the excluded IPs so that I can manually add them.

still cannot get into Settings/Websites - just a blank page.
Any error in your webserver error logs?