VIEWMOL currently cannot handle GAUSSIAN outputs which contain cartesian f functions (10f).
If VIEWMOL runs in color map (that should only happen on IBM RS6000 with Sabine graphics adapters, in this case the background of the title screen has a constant color instead of the usual dark top and lighter bottom) shadows are not drawn if the drawing mode is "with surface".
If TIFF files are saved make sure no other window (including dialog boxes) overlaps with the window to be saved. The information is read from the screen and overlapping windows will show up in the saved file.
HPGL outputs for drawings which are labeled with non-latin characters will not contain any labels. HPGL output has only support for German umlauts, Postscript provides all ISO-8859-1 and KOI-8 characters.
If VIEWMOL has been linked with a Mesa version 2.1 and is running on Linux the "Lines while rotating" button should always be set to on (the default). If it is set to off, a model is drawn with surfaces, and tried to rotate, VIEWMOL will crash with a floating point exception. This is a bug in early Mesa versions.
VIEWMOL is now usable with Lesstif ( 0.81). There are, however, some glitches, e. g. shortcuts don't work.