I have not encountered this either, I have also used IE6 & IE7 and both seem to be fine.
You may encounter log outs if you spend time on Useek whist you are logged in through say your works network, as a lot of work networks/firewalls are set up to disconnect web-site which are inactive (reading posts) for a certain amount of time, this is to prevent empolyees streaming/ watching movies and other media via the web, when they should be working!!! Hehe...
