Hey,
I seem to have stumbled upon the same problem. I have two search
panels which are quite similar and use the textbox for exactly the
same reason. However, one panel works perfectly and doesn't give
the ...Doing a super.requestRectangleOnScreen... error. The other
panel is extremely slow, which probably has something to do with the
errors it gives. I have had no luck finding out the problem yet, but
once I do I'll be sure to share. ;)