Posted by Toodledo:
It sounds like a problem with your web browser. Please try restarting the browser. You may have a plugin that is causing a problem. You can test a different browser and see if that helps.
Should have mentioned I did close and re-open the browser which didn't help. The problem is still there today.
I decided, based on your suggestion, to try downloading FF4, which I have been unable to do in the past because this is a state computer and other browsers were blocked for download. But for some reason, it isn't blocked now, and I've got FF4 running! Great news, not only is it a far better browser, but all of the features of TD I haven't been able to use, particulary freezing the menus at the top, are now working.
Thanks again!