The invoice template "Professional 1" does not have unit prices. You'll need to change your invoice template to "Professional 2".

Please go into Settings->Invoice Defaults, then change the default invoice template to "Professional 2". Then press update settings. Then close Invoice Expert. Then reopen Invoice Expert and create a brand new invoice. Make sure the template has defaulted to Professional 2, add some items and then click print, you should see the unit quantities/prices.

Sometimes existing invoice that have already been printed with an old template don't update to the new template until you press Add/Update invoice multiple times. Basically when you press print we keep a cached copy of the last printed invoice.