Just wanted to inject a little info for the possible benefit of our members.
About a week ago I read on the 'net that Microsoft was releasing Internet Explorer 8, which was supposed to remedy some of the problems encountered in earlier versions of the browser. Well, I downloaded it from the MS site (it's free) and have been using it for the past week with no problems. However, today I tried to log on to a website that requires a username and password. After entering the correct information and clicking on the log-on button, all I got was a blank screen. I tried several more times with the same result. I emailed them to see if they were having technical difficulties and lo and behold, they told me that IE8 wasn't compatible with their software. Said I'd have to download Firefox to log on. I did and it worked okay. So if you encounter problems logging onto a site and you're using IE8, that may be the cause.