If thats the case, then sometimes it can be resolved while leaving Rasterize off, by going to Tools > Options > Vectorworks Preferences > Display and changing the setting for GDI Imaging (Windows) or Quartz Imaging (Mac).
Some fonts need it on, some need it off. It doesn't always work with any font, but its worth trying when custom fonts aren't behaving properly.
However that option can affect your transparencies if used in the document, so make sure to check them before printing.