Thanks for putting me right about the 'hidden' comment. I understand the difference between a Beta release and a GA release. I was giving you an 'out' as the 7.0.1 release is pretty new still and will probably have a number of other bugs that also need sorting.
I was being a tad metaphorical about the word hidden - but we really do need a solution as to why we cannot add attendees under the 7.0.1 build on Windows 7.
I am not on a corprate network - but am on a homegroup lan with 6 machines of different types ranging from Windows XP pro to Windows 7 to Linux.