I can't say I've understood all the detail being discussed but I can inform you of two things:<br><br>1) Mac OS X version of Firefox has a bug where the cursor is sometimes not positionable AT ALL. That is to say, clicking in a text field does not give it the focus. It is an intermittent (though fairly frequent) bug and is listed in the Firefox bug tracking system (with an indication nobody is working on it). It can usually be alleviated by minimizing the Firefox window and restoring, but not always.
<br><br>2) On XP Firefox I occasionally find that the cursor disappears when using GMail (as I am now) however the text entry works as normal. Sometimes this manifests itself as the cursor disappearing when you enter a space character but suddenly reappearing when the next visible character appears.
<br><br>So, in a nutshell, if you have cursor problems that occur with Firefox only - BLAME THE BROWSER. It's obviously got significant issues in this area.<br><br>-- <br>Allister