I have come across some awkward behavior with new Discussion Forums message editor.
Previously, if you wanted to add a smiley, or a link or image, when you clicked the button aboved the edit window, those features behaved more like a menu drop down or had a dialog box. With the new editor, those features come up in a separate window. Using IE6.0 at work, the new behavior is pretty similar to the way it worked before. However, using IE7.0 at home, these come up as separate tabs within IE. So instead of getting a small menu dropdown or dialog box to select a smiley, a new IE tab gets created that is mostly blank except for the smileys. Insert an image, a whole new IE tab comes up where you fill in the lines such as the URL to the image.
I like the older method of it behaving like a menu drop down or dialog box, it is awkward how in IE7, these come up as separate tabs in IExplorer.
