I am experiencing a trouble in screen refreshing with Molekel ver 5 and 5.2.. The installatoin completed just fine, and the program started up just nicely. Molekel read GamessUS log file, and it showed MO surface perfectly, but the problem started here. When I rotate the molecule by the mouse, Molekel does not erace the previous surface, and draws a new surface on it. So, as you move the mouse, the screen is smeared over with uneraced surfaces. The system I use is Fedora Core 5. The above trouble was seen in both KDE and GNOME environments. Does anyone know a remedy for this? I would appreciate your help. Nato