[PyQt] QwtPlot axis labels clipped

[Gib Bogle]

This is more of a PyQwt question than a PyQt question, but someone here may know 
the answer.

I'm using the QwtPlot widgets with QtDesigner, on Windows XP.  The numbers 
labeling the ticks on the left y-axis are often (but not always) displayed with 
the left edge cut off, so '8.0' looks like '3.0', for example.  Reducing the 
font size doesn't help.  I'm guessing that this might be a font issue.