"If the font size is changed by a selection from the drop-down menu, the font
size selection box remains active. While letters will be inserted into the
document, a space will trigger the drop-down menu again, and go into selection
mode. The workaround appears to be to type an escape to kill the drop-down
menu, then a tab to deselect the font size selection box, then a backspace to
erase the tab character which was inserted into the document."
Robert Sievers
Open Source Evangelist