I have been using Visitor Maps and Who's online for almost 12 months and find it really useful. However I have a member's only site, yet the majority of the visitors are recorded in Who's been Online as "Guests". Sometimes I have also noticed that a visitor's user number is recorded correctly but then later it has been deleted or shows as Guest.
How do I correct this? Is it likely to be a plugin conflict?
Thanks in advance for your help