There have been various reports of missing title bars, buttons etc from X11() windows under certain window managers. I've never seen this, but Ei-j Nakama encountered it and has supplied a patch which changes the way hinting is done. I've put this into R-devel, and would be grateful to know if it solves the problem for those who do see this.
Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595