Umm Nope. Sorry! I put it down to maybe corruption in the database. I restored to a working version and the problem disappeared. I think it may be linked to googleanalytics and trying to get that working!
Another thing I noticed was my account lost admin permissions and the user could not stay logged on using an iphone and then the whole site just started acting weird. That prompted the restore so sorry, unfortunately I have no way of replicating it!
If it happens again I will certainly let you know.
FYI, the install and plugin updates all went fast and smooth! from a bare site to a funcitoning site in 1/2hr. So anyone experiencing issues with installs it could be corrupt download or a configuration problem.